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DTSTART;TZID=Australia/Sydney:20210505T150000
DTEND;TZID=Australia/Sydney:20210505T160000
DTSTAMP:20250820T021946Z
CREATED:20250819T102706Z
LAST-MODIFIED:20250820T021946Z
UID:15002-1620226800-1620230400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: David Gozzard (ICRAR / UWA)
DESCRIPTION:Phase Stabilization for Space Science Applications: from radio telescopes to laser communications\n\nAbstract\n\nThe distribution of high-precision time and frequency signals from atomic clocks is indispensable for many fields of fundamental and applied science. Timescale comparison between atomic clocks enables the highest-precision tests of foundational physics including tests of the General Theory of Relativity\, the variability of fundamental constants\, and searches for dark matter candidates. Radio astronomy\, geodesy\, and global navigation satellite systems also benefit from networks of atomic clocks. In order to fully exploit the precision of the atomic clocks\, the transmission link must be more stable than the atomic clocks themselves. However\, disturbances on the link (thermal effects and vibration\, in the case of an optical fibre\, and atmospheric turbulence\, in the case of a free-space link) cause phase and amplitude noise that greatly degrade the precision of the transmission. \n\n This talk will begin with an overview of stabilized frequency transfer technology developed by the ICRAR-UWA Astrophotonics group to phase synchronize the antennas of the SKA telescope. The talk will then cover how this technology is being translated to stabilize ground-to-space laser links for fundamental science and high-bandwidth laser communications applications. \nWatch recording\nSlides\n\nGozzard_CSIRO2021_v1Download\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-david-gozzard-icrar-uwa/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-05052021-scaled.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210428T150000
DTEND;TZID=Australia/Sydney:20210428T160000
DTSTAMP:20250819T102751Z
CREATED:20250819T102751Z
LAST-MODIFIED:20250819T102751Z
UID:15003-1619622000-1619625600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Noor Masdiana Md Said (University of Tasmania / CSIRO)
DESCRIPTION:Intra-Day Variability of Active Galaxies\n\nAbstract\n\nIn this work I have undertaken a detailed investigation of the BL Lac object PKS B1144−379. This project utilised high-cadence flux density monitoring of interstellar scintillation with the University of Tasmania Ceduna 30m radio telescope at a frequency of 6.7 GHz. A complementary kinematic study of the sub parsec-scale jet of PKS B1144−379 has been undertaken\, using 8.6 GHz Very Long Baseline Interferometry (VLBI) data. The centimetre wavelength radio flux density of this source is known to vary on a range of timescales from a few days up to several months. The rapid (timescales of less than a day)\, apparent variability of this compact extragalactic radio source at radio wavelength is known as intraday variability (IDV). The current investigation shows conclusively that the rapid variability is the result of a propagation effect known as interstellar scintillation (ISS)\, which originates in the inhomogeneous interstellar medium (ISM). On the other hand\, the long-term variability (months to years) suggests that the source also exhibits substantial intrinsic evolution. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-noor-masdiana-md-said-university-of-tasmania-csiro/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-28042021.png
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210310T150000
DTEND;TZID=Australia/Sydney:20210310T160000
DTSTAMP:20250819T102838Z
CREATED:20250819T102837Z
LAST-MODIFIED:20250819T102838Z
UID:15004-1615388400-1615392000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dougal Dobie (Swinburne)
DESCRIPTION:Radio Follow-up of Gravitational Wave Events\n\nAbstract\n\nThe detection of gravitational waves and electromagnetic radiation from a neutron star merger\, GW170817\, heralded the dawn of a new age of astronomy – the multi-messenger era. In this talk\, I will discuss follow-up of two landmark gravitational wave events – GW170817 and GW190814. Radio monitoring of GW170817 enabled tight constraints to be placed on the geometry and energetics of the merger\, while VLBI imaging helped improve the “standard siren” measurement of the Hubble constant. No counterpart to GW190814 has been detected\, but we have carried out 8 follow-up observations with ASKAP\, covering ~90% of the localisation region. We have used these observations to carry out the most sensitive widefield radio transient survey to-date\, and I will also present preliminary results from this search. I will outline prospects for radio follow-up of future gravitational wave events including the vital contributions that radio observations can make to the broader multi-messenger effort\, and quantitative estimates for the detectability of events with current and future facilities. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-dougal-dobie-swinburne/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-10032021-scaled.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210303T150000
DTEND;TZID=Australia/Sydney:20210303T160000
DTSTAMP:20250820T021513Z
CREATED:20250819T102906Z
LAST-MODIFIED:20250820T021513Z
UID:15005-1614783600-1614787200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Nithyanandan Thyagarajan (CSIRO)
DESCRIPTION:Geometric Intuition and Image-plane Methods for Measuring Closure Phases in Interferometry\n\nAbstract\n\nIn interferometric applications\, closure phase refers to the phase of the product of spatial coherences obtained around a closed loop of interferometer elements. Its property of invariance to image-plane translation as well as to phase corruption due to the propagation and element-based instrumental effects\, has been well-known for several decades. The property that this can be measured robustly even using raw and uncalibrated interferometric data makes it a true measurable physical property of the object being imaged\, particularly of the degree of symmetry in the object’s morphology. Therefore\, it has been a valuable tool in challenging interferometric applications that otherwise require high-accuracy phase calibration. Interesting astronomical applications include the Event Horizon Telescope (EHT) imaging of the supermassive black hole event horizon at the centre of M87 using very long baseline interferometry\, an independent approach to statistical detection of redshifted 21 cm power spectrum of neutral Hydrogen during the epoch of reionization\, and optical imaging of stellar surfaces. \n\n Until now\, the understanding of interferometric closure phase has been limited to a mathematical description that gets applied primarily in the aperture-plane (the Fourier domain of the image-plane). However\, a geometrical intuition for this valuable physical quantity has been lacking. I will present the Shape-Orientation-Size (SOS) conservation theorem in the image plane\, which forms the foundation for such an insight. Two geometric methods will be described to measure the closure phase directly from images (without requiring a Fourier- or aperture-plane view) – one using the positional offset of one fringe relative to the other two\, and the other estimated from the areas of the triangles in the aperture and image planes. I will demonstrate this understanding using real data from the Jansky Very Large Array (VLA) and the EHT. These relationships are further generalized to N-element interferometers. \n\n The geometric understanding provided herein can be potentially valuable to optical interferometry and other interferometric applications. I will outline some of these applications including crystallography\, seismic imaging\, interferometric synthetic aperture radar (InSAR)\, synthetic aperture sonar (SAS)\, gravitational wave detection with LISA\, and quantum mechanics and polarized states of light. \n\nSlides\n\nClosurePhaseGeometricInsight_NT_notesDownload\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-nithyanandan-thyagarajan-csiro-2/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-03032021.jpg
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20210224T150000
DTEND;TZID=Australia/Sydney:20210224T160000
DTSTAMP:20250819T102935Z
CREATED:20250819T102934Z
LAST-MODIFIED:20250819T102935Z
UID:15006-1614178800-1614182400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: James Murray (AAL)
DESCRIPTION:AAL Membership Update\n\nAbstract\n\nAAL will be presenting a general update on their activities of the past year or so\, as well as current projects and funding arrangements. There have been some staff and Board changes since we last updated the team at CASS\, so we will touch on these as well. The update will be general in nature\, but will also show CSIRO’s involvement with AAL via committee and member representatives. The presentation will also serve to introduce AAL to new staff at CASS Marsfield or provide a refresher for those within the department who haven’t been in touch with us for a while. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-james-murray-aal/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-24022021.jpg
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