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DTSTART;TZID=Australia/Sydney:20220406T150000
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DTSTAMP:20260517T072006
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\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-marisa-brienza-university-of-bologna/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-06042022.jpg
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DTSTART;TZID=Australia/Sydney:20220420T150000
DTEND;TZID=Australia/Sydney:20220420T160000
DTSTAMP:20260517T072006
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\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-abhimanyu-susobhanan-naoc/
LOCATION:NSW
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:20260517T072006
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\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-emma-ryan-weber-swinburne/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-27042022.png
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