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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220216T150000
DTEND;TZID=Australia/Sydney:20220216T160000
DTSTAMP:20260524T071942
CREATED:20250819T082323Z
LAST-MODIFIED:20250819T082323Z
UID:14983-1645023600-1645027200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Joe Callingham (ASTRON/Leiden University)
DESCRIPTION:Radio Stars and exoplanets\n\nAbstract\n\nOne key question that astronomy is attempting to answer is whether there are habitable planets around stars other than our Sun. While we have entered an era where identifying nearby exoplanets has become standard\, discerning whether the environmental conditions dictated by the host stars are suitable for life has proved far more elusive. The detection of low-frequency radio emission from an M dwarf or an exoplanet provides a direct probe of extrasolar space weather and the planet’s magnetic field – information crucial for assessing the potential habitability of the planet. In this talk\, I will outline our LOFAR survey of stellar systems\, with a focus on our recent detection of strong\, highly circularly polarised low-frequency radio emission associated with nearby stars – the expected signpost of star-exoplanet interactions. I will discuss how our survey represents the most comprehensive observations of stellar systems at low frequencies\, and the implications of this new population in understanding the magnetosphere of M dwarfs and exoplanetary magnetic fields. I will conclude with our progress in determining the expected periodicity of the radio emission from star-planet interactions. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-joe-callingham-astron-leiden-university-2/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-16022022.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220309T150000
DTEND;TZID=Australia/Sydney:20220309T160000
DTSTAMP:20260524T071942
CREATED:20250819T081913Z
LAST-MODIFIED:20250820T025013Z
UID:14982-1646838000-1646841600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Marcus Lower (CSIRO)
DESCRIPTION:A radio-loud magnetar with an identity crisis\n\nAbstract\n\nMagnetars are a rare class of highly magnetised neutron star. They are the primary source of local gamma-ray bursts and are speculated to produce a significant fraction of extragalactic fast radio bursts. Studying the local population of magnetars within the Milky Way is therefore key to understanding these highly energetic objects and the role they play in the transient sky. In this talk\, I will present the initial results of on-going project to monitor a peculiar radio-loud magnetar\, Swift J1818.0-1607\, with Murriyang\, the Parkes 64-m radio telescope. This includes the unusually pulsar-like properties of this object seen in early observations\, and a brief identity crisis in which the neutron star displayed a host of unique behaviour never before seen any other radio pulsar. \nWatch recording\nSlides\n\nMarcus_Lower_colloquiumDownload\n\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-marcus-lower-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-09032022-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220316T150000
DTEND;TZID=Australia/Sydney:20220316T160000
DTSTAMP:20260524T071942
CREATED:20250819T080622Z
LAST-MODIFIED:20250820T025109Z
UID:14981-1647442800-1647446400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Charlotte Ward (University of Maryland)
DESCRIPTION:Tracing the first massive black hole seeds and their merger-driven growth with the Zwicky Transient Facility.\n\nAbstract\n\nOver the last 3 years\, the Zwicky Transient Facility (ZTF) has demonstrated the capability of wide-field time-domain surveys to discover the important black hole populations which trace the formation of the first massive black hole seeds and their merger-driven growth. For instance\, our search for off-nuclear active galactic nuclei (AGN) in ZTF revealed 9 supermassive black holes (SMBHs) which may have been ejected from their host galaxy by gravitational wave recoil from SMBH mergers with misaligned spins. Likewise\, our search for variable intermediate mass black holes (IMBHs) in dwarf galaxies found 200 new IMBH candidates\, most of which could not have been found via their spectroscopic signatures alone. Finally\, our study of periodically variable AGN with double-peaked broad emission lines revealed how single AGN can mimic SMBH binaries and mergers. We found these rare black holes amongst large populations of AGN in part by using innovative forward modelling techniques to improve photometric sensitivity and measure the separations between variable objects and their host galaxies. Our work is an exciting precursor to the Legacy Survey of Space and Time which we expect to detect substantially larger populations of recoiling SMBH and IMBH candidates. \nWatch recording\nSlides\n\ncharlotte_ward_colloquiumDownload\n\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-charlotte-ward-university-of-maryland/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-16032022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220323T150000
DTEND;TZID=Australia/Sydney:20220323T160000
DTSTAMP:20260524T071942
CREATED:20250819T080543Z
LAST-MODIFIED:20250819T080544Z
UID:14980-1648047600-1648051200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Christian Reichardt (University of Melbourne)
DESCRIPTION:Searching for New Physics on the last covid-free* continent\n\nAbstract\n\nMeasurements of the polarisation of the cosmic microwave background (CMB) are an important tool to test our understanding of the Universe. Searches for the faint CMB B-mode signals offer the prospect of detecting inflationary gravitational waves on large angular scales and mapping out the large scale distribution of matter in the Universe through CMB lensing on smaller angular scales. The Antarctic plateau\, in addition to being one of the few places isolated enough to avoid covid\, is an exceptional site for microwave astronomy\, and is the home of the South Pole Telescope. I will show recent results from the SPT-3G camera on the South Pole Telescope. I will also say a few words about CMB-S4\, a new experiment being built for first light at the end of the decade. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-christian-reichardt-university-of-melbourne/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-23032022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220406T150000
DTEND;TZID=Australia/Sydney:20220406T160000
DTSTAMP:20260524T071942
CREATED:20250819T080032Z
LAST-MODIFIED:20250819T080032Z
UID:14979-1649257200-1649260800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Marisa Brienza (University of Bologna)
DESCRIPTION:Insights into the AGN Life-cycle and Feedback from Low Frequency Radio Observations\n\nAbstract\n\nJets from active galactic nuclei (AGN) are a recurrent phenomenon in a galaxy’s lifetime. Understanding their life-cycle is essential for quantifying the energetic impact they have on their surrounding medium. This is in fact a key ingredient driving the thermal evolution of galaxy groups/clusters and\, in turn\, the evolution of galaxies in the universe over cosmic times. In these years the unprecedented sensitivities provided by SKA precursors/pathfinders are significantly pushing forward the study of the jet life-cycle and the jets’ interaction with the external medium. Here I will discuss some recent progress made in this field using observations at MHz-frequencies\, which are especially suited to unveil the oldest populations of particles injected by AGN jets in their surrounding environment. These are allowing us to select new samples of jetted AGN in different phases of their evolution\, as well as follow the interaction/mixing of the AGN jet plasma with the surrounding medium for hundreds of million years. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-marisa-brienza-university-of-bologna/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-06042022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220420T150000
DTEND;TZID=Australia/Sydney:20220420T160000
DTSTAMP:20260524T071942
CREATED:20250819T075948Z
LAST-MODIFIED:20250819T075949Z
UID:14978-1650466800-1650470400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Abhimanyu Susobhanan (NAOC)
DESCRIPTION:The Indian Pulsar Timing Array 3.5-year Data Release\n\nAbstract\n\nPulsar Timing Arrays (PTAs) are astronomical experiments that aim to detect gravitational waves in the nanohertz frequency regime by observing an ensemble of millisecond pulsars (MSPs). The Indian Pulsar Timing Array (InPTA) experiment\, operational since 2015\, aims to use the unique strengths of the Giant Metrewave Radio Telescope to help detect nanohertz gravitational waves. The wide low-frequency coverage provided by the uGMRT enables very accurate characterization of radio frequency-dependent effects in the pulsar signal\, such as interstellar dispersion and scattering\, which are major sources of noise in PTA experiments. In this talk\, I will provide an overview of the InPTA experiment and present recent results from the upcoming InPTA data release 1\, which includes precise time-of-arrival and dispersion measure estimates for 14 MSPs spanning 3.5 years. This dataset forms the basis of our recent studies and findings\, including the 2021 profile change event in PSR J1713+0747\, the detection of solar coronal mass ejection from DM excess in timing measurements of PSR J2145-0750\, the investigation of scatter broadening in the low-frequency profile of PSR J1643-1224\, and the determination of dispersion measures and ToA residuals in multiple pulsars using the wideband timing technique. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-abhimanyu-susobhanan-naoc/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-20042022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220427T150000
DTEND;TZID=Australia/Sydney:20220427T160000
DTSTAMP:20260524T071942
CREATED:20250819T075614Z
LAST-MODIFIED:20250819T075615Z
UID:14977-1651071600-1651075200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Emma Ryan-Weber (Swinburne)
DESCRIPTION:The photons that ionized the Universe\n\nAbstract\n\nLess than 1 billion years after the Big Bang the hydrogen in the Universe transitioned from a neutral to ionized state. The details surrounding the Epoch of Reionization are among the biggest unknowns in modern astrophysics. Significant progress has been made in the last 5 years on when the reionization of cosmic hydrogen concluded\, however we are yet to discover exactly how much ionizing radiation escapes from galaxies through to the intergalactic medium. Determining the escape fraction (fesc) of ionizing radiation is key to modelling and understanding this era. I will summarise our team’s effort on three different fronts. 1) The direct detection and characterisation of Lyman-continuum emission from galaxies just after the reionization era; 2) The lack of correlation between oxygen emission lines and Lyman continuum escape fraction; 3) IGM transmission bias and methodology for recovering the posterior probability distribution of fesc. Our observations shows that a small fraction (or during a small fraction of time or viewing angle) of Lyman continuum emitters tend to be high fesc (“on”)\, whereas most galaxies have fesc close to zero (“off”). The complementary theoretical work highlights the limitations of the common practice of assuming average\, smooth IGM transmission functions. To finish\, in a look to the future\, I will introduce our plans to use a new instrument MAVIS (co-led by Australia) to measure the escape fraction of ionizing radiation from redshift 6 galaxies at the conclusion of the Epoch of Reionization. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-emma-ryan-weber-swinburne/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-27042022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220511T150000
DTEND;TZID=Australia/Sydney:20220511T160000
DTSTAMP:20260524T071942
CREATED:20250819T075504Z
LAST-MODIFIED:20250820T032648Z
UID:14976-1652281200-1652284800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Manisha Caleb (University of Sydney)
DESCRIPTION:Exploring the transient landscape with MeerKAT\n\nAbstract\n\nFast radio bursts (FRBs) have a story which has been told and retold many times over the past few years as they have sparked excitement and controversy since the pioneering discovery in 2007. The FRB class encompasses a number of microsecond-millisecond duration pulses occurring at Galactic to cosmological distances with energies spanning several orders of magnitude. While most FRBs have been observed as singular events\, a small fraction of them have been observed to repeat over various timescales leading to an apparent dichotomy in the population. Though ~50 progenitor model theories have been proposed with the majority involving neutron stars\, no consensus has emerged for their origin(s). However\, with the discovery of an FRB-like pulse from the Galactic magnetar SGR J1935+2154\, magnetar engine models appear to be the current leading favourite. In this talk\, I will present an overview of the field of FRBs and the recent results from the MeerTRAP project at the MeerKAT radio telescope. \n\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-manisha-caleb-university-of-sydney/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-11052022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220518T150000
DTEND;TZID=Australia/Sydney:20220518T160000
DTSTAMP:20260524T071942
CREATED:20250819T075355Z
LAST-MODIFIED:20250819T075355Z
UID:14975-1652886000-1652889600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Kelly Gourdji (Swinburne)
DESCRIPTION:LOFAR observations of neutron star mergers\n\nAbstract\n\nBoth coherent and incoherent low-frequency radio emission are predicted at various timescales when neutron stars coalesce. In this talk\, I show how the Low-Frequency Array (LOFAR) is being used to catch both fast and slow radio transients related to neutron star mergers. At the earliest timescales\, coherent emission resembling FRBs is predicted by several theoretical models. Testing these models can shed light on the nature of the merger remnant and other important questions\, but requires rapid triggered observations. Here\, I show how we are using LOFAR to trigger on short gamma-ray bursts (SGRBs) detected by Swift\, which have neutron star merger progenitors. In addition to possible prompt emission\, there will be a long-lasting synchrotron afterglow caused by the merger ejecta’s interaction with the ambient medium. The afterglow contains a wealth of information including the geometry and energy of the merger outflow. The biggest challenge associated with detecting the electromagnetic counterpart of gravitational wave (GW) merger events\, however\, is the large uncertainty (tens-hundreds of square degrees) on their locations. Here\, I demonstrate our strategy which applies LOFAR’s high sensitivity and large field of view to search for GW merger radio counterparts. I present results from LOFAR follow-up observations of merger events from the last GW observing run. I also show how the high sensitivity\, large field of view and range of epochs permit us to probe previously unexplored parts of general radio transient phase space. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-kelly-gourdji-swinburne/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-18052022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220525T150000
DTEND;TZID=Australia/Sydney:20220525T160000
DTSTAMP:20260524T071942
CREATED:20250819T075315Z
LAST-MODIFIED:20250819T075315Z
UID:14974-1653490800-1653494400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Ron Ekers (CSIRO)
DESCRIPTION:A brief history of the discovery of Sgr A*\n\nAbstract\n\nThe discovery of radio emission from the centre of our galaxy leading up to the EHT image of the SgrA* black hole is a story of discovery\, controversy\, serendipity\, black holes\, Nobel prizes\, mysterious patterns around the galactic centre and now the EHT black hole image magic. The initial discovery of the radio source Sagittarius A and its association with the centre of the Milky Way is a fascinating story\, involving CSIRO-RPL personnel and prominent US and Dutch astronomers. But by “discovery” I do not mean a single event. Contrary to the conventions in science that award prizes\, professional respect and makes press releases\, discovery is a lengthy process involving many actors\, many different kinds of contributions\, and many events over a period of time — 70 years in the case of the galactic centre! I will conclude with a summary of the EHT result and my views on this very difficult analysis. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-ron-ekers-csiro-2/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-25052022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220615T150000
DTEND;TZID=Australia/Sydney:20220615T160000
DTSTAMP:20260524T071942
CREATED:20250819T075210Z
LAST-MODIFIED:20250820T032633Z
UID:14973-1655305200-1655308800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Marcin Glowacki (Curtin)
DESCRIPTION:MeerKATs\, Lions\, and work with CRAFT\n\nAbstract\n\nIn this talk\, I will present work on a variety of projects. I will begin with the Looking At the Distant Universe with the MeerKAT Array (LADUMA) survey\, among other projects I’ve been involved in with the MeerKAT telescope. Upcoming neutral hydrogen (HI) emission surveys such as LADUMA with SKA Pathfinder telescopes will greatly increase our understanding of galaxy evolution\, especially as a function of redshift. I will highlight the detection of ‘Nkalakatha’\, the first high-redshift OH (hydroxyl) megamaser found through the main emission lines\, and the first scientific result of LADUMA. \n\n Following this\, I will showcase results of baryonic Tully-Fisher relation (BTFR) studies conducted with the cosmological hydrodynamic Simba galaxy simulations. Results from Simba have been compared to observational BTFR studies in the local Universe. By constructing mock HI cubes\, we also make a prediction on whether LADUMA could detect a redshift evolution of the BTFR. Other Simba projects will also be highlighted\, that will complement LADUMA and other SKA precursor science surveys. Lastly\, I will highlight the Commensal Real-time ASKAP Fast Transients (CRAFT) survey\, which I am now working on at Curtin University. CRAFT is currently developing the CRAFT Coherent (CRACO) system\, which will greatly increase the efficiency of detecting and localising fast radio bursts to their host galaxies. \n\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-marcin-glowacki-curtin/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-15062022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220706T150000
DTEND;TZID=Australia/Sydney:20220706T160000
DTSTAMP:20260524T071942
CREATED:20250819T074945Z
LAST-MODIFIED:20250820T032616Z
UID:14972-1657119600-1657123200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Rob Wittenmyer (University of South Queensland)
DESCRIPTION:USQ’s Mount Kent Observatory: Australia’s newest exoplanet machine\n\nAbstract\n\nIn the past five years\, the University of Southern Queensland’s Mount Kent Observatory has undergone a dramatic expansion to become Australia’s leading exoplanet observatory. The MINERVA-Australia telescope array is a partnership between MIT\, UNSW Sydney\, George Mason University\, University of Louisville\, Nanjing University\, University of Texas\, and the University of Florida. It is the only southern hemisphere observatory wholly dedicated to the detailed follow-up of planet candidates from NASA’s Transiting Exoplanet Survey Satellite (TESS)\, and has contributed to the confirmation of 30 planets to date — about 15% of all TESS confirmed planets. I present mass measurements and system parameters for several new planets using MINERVA-Australis radial velocities\, and give preliminary results from our new multi-telescope photometric capability to validate small TESS planet candidates. I also describe our longer-term plans for extended mission science and new large telescopes\, taking advantage of the unique capabilities of this dedicated observatory. \n\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-rob-wittenmyer-university-of-south-queensland/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-06072022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220810T150000
DTEND;TZID=Australia/Sydney:20220810T160000
DTSTAMP:20260524T071942
CREATED:20250819T074845Z
LAST-MODIFIED:20250820T032556Z
UID:14971-1660143600-1660147200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Vivek Venkatraman Krishnan (MPIfR)
DESCRIPTION:Timing and searching for binary pulsar systems with the MeerKAT telescope\n\nAbstract\n\nPulsars in relativistic binary (RelBin) systems are remarkable laboratories in space for understanding gravity and binary evolution. Timing pulsars in such binaries has long long provided some of the most precise measurements of neutron star masses; tests of general relativity and alternative theories of gravity; and have been pivotal in our understanding of the evolution of compact object binaries. The advent of the MeerKAT telescope\, with its superior sensitivity in the Southern sky\, has been transformational for RelBin science: Timing previously known systems has provided rapid mass measurements and the search for new systems has resulted in a slew of discoveries via both targeted and all-sky searches. In this talk\, I will provide an overview of the ongoing pulsar timing and searching efforts with the MeerKAT telescope\, and discuss the exciting science that these observations have already enabled\, with a particular focus on the RelBin systems. \n\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-vivek-venkatraman-krishnan-mpifr/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-10082022.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220817T150000
DTEND;TZID=Australia/Sydney:20220817T160000
DTSTAMP:20260524T071942
CREATED:20250819T074721Z
LAST-MODIFIED:20250819T074722Z
UID:14970-1660748400-1660752000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: David McConnell (CSIRO)
DESCRIPTION:A history of radioastronomy in CSIRO – a personal view\n\nAbstract\n\nOver my 45 years practicing Radio Astronomy I have followed a track never far from then technology-science boundary\, the interface between the measurement process and the use of the measured results to advance knowledge. And for the most part\, that track has wandered about within CSIRO. I will present a history (not THE history) of radioastronomy in CSIRO based upon my experience\, complete with personal bias and the distortions of faulty or failing memory. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-david-mcconnell-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-17082022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220824T150000
DTEND;TZID=Australia/Sydney:20220824T160000
DTSTAMP:20260524T071942
CREATED:20250819T074624Z
LAST-MODIFIED:20250819T074625Z
UID:14969-1661353200-1661356800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Hyunwoo Kang (KASI)
DESCRIPTION:SKA Korea\, Now and with AUS\n\nAbstract\n\nPatiently\, SKA Korea is trying to join SKAO\, next generation of radio astronomy. SKA Korea is organised by various scientists\, and has worked many activities. From experiences of Korea radio telescope system\, there are some prepared engineering groups to work together building the future system. As cooperation way with Australia\, SRC activities\, contributions related with SKA-Low construction\, and Phased Array system will be good candidates. As a small\, but big step\, one Korean is sent as a liaison in Australia. Another small talk is prepared to make you understand Korea well. Here are links to three movies in English\, about Korean astronomical heritage\, for you to enjoy: the CheomSeongDae Observatory\, the Joseon Clocks\, and the 14th Century Cheongsang Yeolcha Bunyajido star chart. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-hyunwoo-kang-kasi/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-24082022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220831T150000
DTEND;TZID=Australia/Sydney:20220831T160000
DTSTAMP:20260524T071942
CREATED:20250819T074402Z
LAST-MODIFIED:20250819T074403Z
UID:14968-1661958000-1661961600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jimi Green (SKAO)
DESCRIPTION:SKAO in Australia and the SKA-Low Science Operations Outlook\n\nAbstract\n\nI will provide a brief update on the observatory as a whole\, then an update on the progress of the growing SKAO entity in Australia\, including the Science and Engineering Operations Centres. I’ll outline the plan for the science operations team\, the breakdown between operations\, verification and commissioning\, and highlight pathways for involvement (from students through to jobs). \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jimi-green-skao/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-31082022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220907T150000
DTEND;TZID=Australia/Sydney:20220907T160000
DTSTAMP:20260524T071942
CREATED:20250819T074311Z
LAST-MODIFIED:20250819T074312Z
UID:14967-1662562800-1662566400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Anita Petzler (CSIRO)
DESCRIPTION:Hydroxyl as a  probe of the interstellar medium\n\nAbstract\n\nThe molecular gas of the interstellar medium provides the raw material for star formation\, yet its principle component – molecular hydrogen – is essentially invisible at radio wavelengths. Instead\, we must infer its presence and properties through the study of other tracer molecules\, such as hydroxyl (OH). OH\, with its four ground-rotational transitions at 1612\, 1665\, 1667 and 1720 MHz is a challenging molecule to observe due both to the weakness of its lines and the complexity of their excitation. However\, the complex excitation of OH holds valuable information about the host molecular gas. The satellite lines at 1612 and 1720 MHz in particular\, with their ubiquitous anomalous excitation\, are much more sensitive to local conditions than the main lines which rarely diverge from their expected excitation at local thermodynamic equilibrium (LTE). In this talk\, I will discuss my PhD research which focused on exploring the utility of this interesting molecule. I will also introduce my current project which is to monitor the time-variability of high-gain OH masers in star-forming regions. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-anita-petzler-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-07092022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220914T150000
DTEND;TZID=Australia/Sydney:20220914T160000
DTSTAMP:20260524T071942
CREATED:20250819T074217Z
LAST-MODIFIED:20250819T074218Z
UID:14966-1663167600-1663171200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Stella Ocker (Cornell)
DESCRIPTION:Scattering horizons for Fast Radio Bursts\n\nAbstract\n\nFast radio bursts (FRBs) flicker across the sky at millisecond timescales thousands of times per day. Despite their unknown origins\, the chromatic propagation effects FRBs experience along their journeys to the observer can be used to probe the distribution and turbulence of ionized gas from the Milky Way to their host galaxies. FRB scattering\, in particular\, is sensitive to small-scale electron density fluctuations that are inaccessible to many other observational probes. In this talk\, I will discuss current constraints on scattering in the circumgalactic medium and FRB host galaxies\, and the implied prospects for probing these respective media with a large future sample of FRBs. In addition\, I will discuss modelling of the cumulative scattering from the Milky Way to host galaxies for FRBs at redshifts > 1\, which suggests that scattering may undermine the use of FRBs as probes of galaxies and cosmology from near the peak of cosmic star formation to the epoch of reionization. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-stella-ocker-cornell/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-14092022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20220921T150000
DTEND;TZID=Australia/Sydney:20220921T160000
DTSTAMP:20260524T071942
CREATED:20250819T074126Z
LAST-MODIFIED:20250819T074127Z
UID:14965-1663772400-1663776000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Tristan Reynolds (ICRAR/UWA)
DESCRIPTION:Hopping into a new era of extragalactic radio astronomy with WALLABY\n\nAbstract\n\nNeutral hydrogen (HI) gas provides the reservoir for future star formation and is important to understanding how galaxies form and evolve. HI in galaxies is abundant\, relatively easy to detect and provides a wealth of information on the host galaxy including distance\, mass and density\, motion (e.g. rotation) and the influence of the local environment. Current HI datasets are limited in the total number of galaxies detected and spatial resolution\, but this is about to change thanks to the next-generation HI surveys on Square Kilometre Array pathfinders\, including WALLABY. WALLABY will be transformational in our understanding of the HI content of galaxies through detecting ~210\,000 galaxies in HI and spatially resolving HI in several thousand of galaxies over the Southern sky. I will provide an update on the current status of the WALLABY survey. I will also present some of my recent WALLABY results in which I take advantage of the spatial resolution to study the interplay between environment\, HI content and galaxies’ stellar and star forming quantities. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-tristan-reynolds-icrar-uwa/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-21092022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221005T150000
DTEND;TZID=Australia/Sydney:20221005T160000
DTSTAMP:20260524T071942
CREATED:20250819T074007Z
LAST-MODIFIED:20250819T074007Z
UID:14964-1664982000-1664985600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Meriem Beheri (SISSA)
DESCRIPTION:Radio Selected NIR-dark sources shedding light on the dark side of high redshift SFR\n\nAbstract\n\nAbout 12 billion years ago\, the Universe was first experiencing light again after the dark ages\, and galaxies filled the environment with stars\, metals\, and dust. How efficient was this process\, and how fast did these primordial galaxies form stars and dust? We can answer these questions by tracing galaxies star formation rate density (SFRD) back to its unexplored high redshift tail\, traditionally observed in the Near-InfraRed (NIR)\, Optical\, and UV-bands. This means that the dustiest objects were missing. Further\, most studies on dust obscured galaxies at high redshift have been conducted in the sub-millimetre\, possibly affected by dust temperature biases. In this talk\, I will introduce you to the characterisation of Radio Selected NIR-dark (RS-NIRdark) sources in different fields with a panchromatic approach and new SED-fitting techniques developed by the GOThA (Galaxy Observational and Theoretical Astrophysics) group in SISSA. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-meriem-beheri-sissa/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-05102022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221012T150000
DTEND;TZID=Australia/Sydney:20221012T160000
DTSTAMP:20260524T071942
CREATED:20250819T073851Z
LAST-MODIFIED:20250819T073851Z
UID:14963-1665586800-1665590400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Xiaojin Liu (Beijing Normal University\, China)
DESCRIPTION:A Bayesian study of the spin-up process of millisecond pulsars\n\nAbstract\n\nMillisecond pulsars (MSPs) are one of the fastest-spinning objects in the Universe. They are usually believed to attain their fast spin via an accretion process that transfers angular momentum from their companions to the neutron stars\, though the spin-up process remains mysterious and is usually not given with much detail in the literature. The accretion theories\, however\, do predict a simple relation constraining the spin period and its time derivative\, i.e. the so-called spin-up line. Studying the spin-up line will reveal some secrets of the accretion process and probably shed light on finding the fastest spinning pulsars\, including a sub-ms one. In this talk\, I will present our study of the spin-up line using an MSP population. I will show the hierarchical Bayesian method we used and discuss the interesting results we found. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-xiaojin-liu-beijing-normal-university-china/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-12102022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221019T150000
DTEND;TZID=Australia/Sydney:20221019T160000
DTSTAMP:20260524T071942
CREATED:20250819T073718Z
LAST-MODIFIED:20250819T073718Z
UID:14962-1666191600-1666195200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Bi-Qing For (UWA)
DESCRIPTION:ASKAP WALLABY: dwarf galaxies in the local universe\n\nAbstract\n\nLow-mass\, or dwarf\, galaxies are the primary source of ionising photons during the epoch of reionisation and they are the building blocks of galaxies in the early Universe. Thus\, they play an important role as the strongest test for the standard Cold Dark Matter model on the smallest scale. In this talk\, I will present the results and goals of two ongoing dwarf galaxies-related projects that utilise ASKAP WALLABY data in conjunction with other legacy multiwavelength data. The two main studies are (1) probing role of galaxy interactions in quenching at low-mass end and (2) probing the formation mechanisms of low-surface brightness ‘dwarf’ galaxies (ultra-diffuse galaxies) from the HI perspective. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-bi-qing-for-uwa/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-19102022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221026T150000
DTEND;TZID=Australia/Sydney:20221026T160000
DTSTAMP:20260524T071942
CREATED:20250819T073652Z
LAST-MODIFIED:20250819T073653Z
UID:14961-1666796400-1666800000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Yik Ki Ma (ANU)
DESCRIPTION:ASKAP as the Magnetic Probe of the Small Magellanic Cloud?\n\nAbstract\n\nHigh spatial resolution observations of the diffuse atomic (HI) gas have led to the realisation that the HI filamentary structures in the solar neighbourhood are aligned with the ambient magnetic field. It remains unclear whether this is a general attribute of the ISM across a large Galactic volume\, as well as in other galaxies with vastly different astrophysical characteristics. Using the high quality data from the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope for the Galactic ASKAP HI (GASKAP-HI) survey\, I investigated whether the ~10 pc-scale HI filaments in the Small Magellanic Cloud (SMC) can act as compass needles tracing the galactic magnetic field structure. Furthermore\, I mapped the preferred orientation of these filamentary HI structures to reveal the astrophysical processes shaping the ISM in the SMC. In this talk\, I will present the results from this work\, as well as highlighting the potential synergies between the GASKAP-HI and the POSSUM surveys. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-yik-ki-ma-anu/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-26102022-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221102T150000
DTEND;TZID=Australia/Sydney:20221102T160000
DTSTAMP:20260524T071942
CREATED:20250819T073623Z
LAST-MODIFIED:20250819T073624Z
UID:14960-1667401200-1667404800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Shanika Galaudage (Monash)
DESCRIPTION:Investigating the lives of black holes and neutron stars with gravitational waves\n\nAbstract\n\nThe field of gravitational-wave astronomy provides us with a wealth of information about the most extreme objects in the Universe. Since 2015\, there have been over 90 detections of merging black holes and neutron stars. With the growing number of gravitational wave events\, we can study the overall population of events\, allowing us to probe stellar evolution and formation mechanisms of these compact binaries. In this talk\, I describe the emerging picture of the formation of binary black hole systems using observations from LIGO-Virgo-KAGRA. I will also present some insights into the population of binary neutron stars\, and the implications for radio and gravitational-wave astronomy. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-shanika-galaudage-monash/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-02112022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221118T150000
DTEND;TZID=Australia/Sydney:20221118T160000
DTSTAMP:20260524T071942
CREATED:20250819T073431Z
LAST-MODIFIED:20250819T073439Z
UID:14959-1668783600-1668787200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Rick Perley (NRAO)
DESCRIPTION:MeerKAT and VLA Polarimetric Calibration – Establishing the true EVPAs of 3C286 and 3C138\n\nAbstract\n\nThe radio quasars 3C286 and 3C138 have long been used to determine the EVPAs of polarimetric imaging with the VLA. Since at least the 1960s\, it has been ‘accepted wisdom’ that the correct EVPA of 3C286 is 33 degrees at all frequencies. However\, recent VLA observations of the moon\, Venus\, and Mars have shown there are small\, but significant deviations from the presumed 33 degrees\, resulting in about a 10 degree spread between 1 and 50 GHz. Recent MeerKAT observations have confirmed this spread at their frequencies of overlap\, and strongly suggest much larger deviations to lower values are seen below 1 GHz. However\, accurate estimation of the EVPAs below ~1 GHz will require accurate corrections for ionospheric Faraday rotation\, which are currently lacking. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-rick-perley-nrao-2/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-18112022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221123T150000
DTEND;TZID=Australia/Sydney:20221123T160000
DTSTAMP:20260524T071942
CREATED:20250819T073327Z
LAST-MODIFIED:20250819T073328Z
UID:14958-1669215600-1669219200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Quirino D'Amato (SISSA)
DESCRIPTION:High-redshift Supermassive Black Holes grow in dusty\, gas-rich environment\n\nAbstract\n\nA large fraction of supermassive black holes (SMBHs) located in Active Galactic Nuclei (AGN) at galaxy centres grow hidden by dust and gas. In the local Universe\, the obscuration is often associated with the (sub-)pc-scale circumnuclear medium surrounding the SMBH (i.e. the so-called torus)\, as postulated by the Unified Schemes. However\, deep X-ray observations have shown that the fraction of obscured AGN dramatically increases with redshift. In addition\, thanks to the revolution introduced by new (sub-)mm observatories\, in the last decade increasingly detections of the dusty\, gas-rich interstellar medium (ISM) have been collected in the host galaxies of distant (z≳1.5) AGN. The physical properties of the ISM in galaxies change rapidly with redshift and\, on average\, distant AGN host galaxies are found more compact and denser than their local counterpart. These results suggest that the increased obscuration with redshift might occur on the host galaxy kpc-scale. Observational evidence shows that distant large-scale structures are often composed of gas-rich members\, including the progenitor of the future brightest cluster galaxies. Moreover\, diffuse large reservoirs of cold gas have been detected in the central regions of the intra-cluster medium (ICM) in many proto-clusters. Galaxy clusters are the largest virialized structures in the Universe\, and most of their assembly takes place at the cosmic epoch where both star formation and black hole accretion peak (1< z <3). Exploring the interplay between nuclear activity\, star formation and gas supply in such objects addresses the processes responsible for the build-up of present-day most massive galaxies. The presence of such an extremely dense environment strongly affects the galaxy-SMBH co-evolution through mechanical/radiative feedback processes; in addition\, AGN are known to produce powerful relativistic-particle jets onto scales of several hundreds of kpc\, and increasingly evidence have shown that AGN-feedback can extend on distances far beyond the host galaxy scale. \n\n In this talk I will review the main recent observational results about the ISM content in distant AGN and proto-cluster\, highlight the importance of a multi-wavelength approach and high-resolution observations in determining the ISM/ICM gas reservoir properties such as size\, morphology\, distribution and kinematics. I will discuss the implications of such findings in modelling the evolution of massive galaxies and large-scale structures across cosmic time\, and the role of AGN feedback in regulating such an evolution. In addition\, I will discuss the role of the ISM in obscuring high-z AGN and the incidence of the obscured AGN fraction as a function of the redshift\, presenting multi-wavelength observations and numerical simulations. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-quirino-damato-sissa/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-23112022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221130T150000
DTEND;TZID=Australia/Sydney:20221130T160000
DTSTAMP:20260524T071942
CREATED:20250819T073203Z
LAST-MODIFIED:20250819T073204Z
UID:14957-1669820400-1669824000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Grazia Umana (INAF)
DESCRIPTION:The impact of SKA on Galactic Science: a glimpse at the Galactic plane with SKA precursors\n\nAbstract\n\nAbout 50-70% of the first five years of SKA operations will be devoted to KSPs\, and probably also to Generic Surveys that maximize commensality to a wide range of scientific objectives. There are already several proposed KSPs focused on Galactic Science and we foresee many other KSP concepts being submitted under the breadth of Our Galaxy SWG. SKA\, providing better sensitivity and angular resolution than any of the ongoing/planned surveys of the Galactic plane\, will give the opportunity to create a sensitive wide-field atlas of Galactic radio emission and to address several topics in the field of Galactic radioastronomy. In this talk\, I will summarize the ongoing work aimed at achieving skills and expertise in the run-up to the development of the full SKA to be ready and competitive for leading and participating in a SKA KSP dedicated to Galactic studies\, with particular regard to recent results from the use of SKA precursors. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-grazia-umana-inaf/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-30112022-scaled.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20221213T150000
DTEND;TZID=Australia/Sydney:20221213T160000
DTSTAMP:20260524T071942
CREATED:20250819T073130Z
LAST-MODIFIED:20250819T073130Z
UID:14956-1670943600-1670947200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Venkatesh Ramakrishnan (Aalto University)
DESCRIPTION:Roadmap to a compendium of black hole images\n\nAbstract\n\nThe transformational science on the study of supermassive black holes and other non-horizon objects as enabled by the Event Horizon Telescope opens a window to directly test the effects of General relativity (GR) on various classes of accreting objects. The knowledge garnered from studies of M87* and Sgr A* has to be expanded to several other black holes to enhance our understanding of GR on a cosmological scale. I will present the plans and progress underway of a project with a sample of nearby galaxies. The work entails a multifrequency approach with data obtained from radio to gamma-rays for a more thorough modelling of the broadband SEDs and the variability of accretion flows that are within the gravitational potential of the black hole. Finally\, the interest or the requirement in having both the theory and observations in a close interface for this study will also be discussed. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-venkatesh-ramakrishnan-aalto-university/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-13122022.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20230125T150000
DTEND;TZID=Australia/Sydney:20230125T160000
DTSTAMP:20260524T071942
CREATED:20250819T061924Z
LAST-MODIFIED:20250819T061925Z
UID:14881-1674658800-1674662400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Mark Cheung (CSIRO)
DESCRIPTION:An introduction to Heliophysics\n\nAbstract\n\n \n\nHeliophysics is the study of the Sun and how it influences the space environments around the planets\, other solar system bodies and the interstellar medium. The dynamical nature of the Sun’s activity drives space weather and space climate\, which in turn impact the viability of life and technological infrastructure in the solar system. The Sun is also a natural laboratory for studying fundamental physical processes common to many astrophysical systems. In this talk\, we present multi-wavelength observations for studying solar activity\, give a primer on prominent physical processes (e.g. magnetic reconnection)\, and explore how CSIRO Space & Astronomy can make unique contributions to Heliophysics and space weather. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-mark-cheung-csiro/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-25012023.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20230208T150000
DTEND;TZID=Australia/Sydney:20230208T160000
DTSTAMP:20260524T071942
CREATED:20250819T061850Z
LAST-MODIFIED:20250819T061851Z
UID:14882-1675868400-1675872000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Yuanming Wang (University of Sydney)
DESCRIPTION:Image-plane radio transients on short-timescales with ASKAP\n\nAbstract\n\nShort bursts\, flares\, scintillation and other radio time-domain phenomena usually imply extreme astrophysical environments (e.g. strong magnetic fields) that are difficult to achieve on Earth. This time-domain parameter space\, however\, is relatively unexplored historically\, mainly limited by instrumental sensitivity and field-of-view (FoV). In this talk I will present unusual time-domain transient events I have discovered with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope\, including extreme scintillation\, flaring stars\, and pulsars. \n\n We have used ASKAP to probe timescales of seconds to hours\, searching for rapidly varying radio sources. With the advantage of the large FoV\, we discovered a group of fast-scintillating galaxies arranged linearly on the sky\, spanning approximately 2 degrees. Using this unlikely sky distribution we inferred the presence of a nearby\, straight\, and high-pressured plasma filament between the Earth and those galaxies\, which produces extreme scintillation. Circular polarisation is another poorly explored parameter-space. With ASKAP dual-polarisation beams\, we identified a new pulsar (rapidly rotating neutron star) PSR J0523-7125 through its strong circularly polarised emission and variable behaviour. PSR J0523-7125 shows many unusual properties (e.g.\, upturn spectrum shape)\, which may shed light on the as-yet-unknown pulsar coherent emission mechanism. \n\n Our discovery has filled gaps in this unexplored time-domain parameter space\, and highlighted a new way of finding unusual pulsars – useful for future space-time experiments. The existence of a nearby\, high-pressured plasma filament also changes our understanding of the origins of extreme scintillation\, and requires new models to explain the underlying phenomenon\, as existing theoretical models are incompatible with the structure we measured. The image above is an artist’s illustration of the new pulsar found in the LMC. \n\n \nWatch recording\nEvent details\nDownload iCal\nCategory\nColearnia
URL:https://www.atnf.csiro.au/event/sa-colloquium-yuanming-wang-university-of-sydney/
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-08022023-scaled.jpg
END:VEVENT
END:VCALENDAR