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DTSTART;TZID=Australia/Perth:20260401T120000
DTEND;TZID=Australia/Perth:20260401T130000
DTSTAMP:20260515T125617
CREATED:20260325T192708Z
LAST-MODIFIED:20260401T043523Z
UID:18536-1775044800-1775048400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Yuxiang Qin (Australian National University)
DESCRIPTION:Inferring properties of the first galaxies and intergalactic medium with 21-cm cosmology\n\nAbstract: \n\nThe redshifted 21-cm signal provides a unique probe of the first galaxies and their imprint on the thermal and ionization state of the intergalactic medium (IGM) during the Cosmic Dawn and Epoch of Reionization. In this talk\, I present a unified inference framework that jointly interprets constraints from low-frequency interferometers (e.g.\, HERA and MWA) and global-signal experiments such as EDGES\, in combination with complementary galaxy and CMB observations. \n\nBy jointly modelling these datasets\, we find converging evidence that the IGM was heated early\, ruling out a broad class of cold reionization scenarios and placing new constraints on the X-ray emissivity of the first galaxies. Within a galaxy-driven framework\, these results imply enhanced high-redshift X-ray production relative to local scaling relations\, potentially driven by metal-poor stellar populations and their remnants. In parallel\, global-signal analyses provide independent constraints on the timing and amplitude of the cosmic dawn signal\, and serve as a critical test of its astrophysical interpretation. \n\nAs these early sources are likely beyond the reach of direct detection\, even for facilities such as JWST\, the 21-cm signal remains a uniquely powerful probe of their collective impact. Looking ahead\, I will show how the Square Kilometre Array (SKA) will transform this field\, enabling precision constraints on the thermal history of the IGM and the properties of the first galaxies. \n\nPlease note that the event timezone is AWST (UTC+8 hrs) \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-yuxiang-qin-australian-national-university/
LOCATION:CSIRO – Kensington\, Australian Resources Research Centre (ARRC)\, 26 Dick Perry Ave\, Kensington\, WA\, 6101\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2026/03/yuxiang_qin_apad-1.jpg
ORGANIZER;CN="Gemma Anderson":MAILTO:gemma.anderson@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260402T120000
DTEND;TZID=Australia/Sydney:20260402T123000
DTSTAMP:20260515T125617
CREATED:20260330T071027Z
LAST-MODIFIED:20260330T071028Z
UID:18575-1775131200-1775133000@www.atnf.csiro.au
SUMMARY:Colearnium: Mark Wieringa (CSIRO)
DESCRIPTION:“Overview of my time at ATNF: 35 years in 25 minutes”\n\nThis week Mark Wieringa will provide an “Overview of my time at ATNF: 35 years in 25 minutes“. \n\n \n\n \n\n\n\nPlease let me know if you’re willing to present at a future co-learnium or have requests for specific talks\, thanks! \n\nKind regards\, \n\nStefan Duchesne \n\nTeams meeting link below: \nTeams Meeting\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/colearnium-mark-wieringa-csiro/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
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DTSTART;TZID=Australia/Sydney:20260408T150000
DTEND;TZID=Australia/Sydney:20260408T160000
DTSTAMP:20260515T125617
CREATED:20260330T022844Z
LAST-MODIFIED:20260330T023210Z
UID:18562-1775660400-1775664000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Georgia Stewart (University of Tasmania)
DESCRIPTION:Echoes of the Dying Light: The Evolution and Spectral Signatures of Simulated Remnant Radio Galaxies\n\nAbstract: \n\nRadio galaxy remnants are the quiescent phase of radio-loud active galactic nuclei (RLAGN) and provide key insight into AGN duty cycles and feedback. Observationally\, remnants are challenging to identify\, as their spectral and morphological properties often overlap with active sources\, necessitating multi-frequency data. \n\nIn my PhD\, I worked on the largest suite (to-date) of three-dimensional hydrodynamic simulations of active and remnant RLAGN evolving in realistic environments. Using synthetic radio emission generated from these simulations\, I investigated how jet power\, environment\, and active-phase duration shape the dynamics\, spectral evolution\, and observability of remnants. I showed that low-density environments delay the transition to buoyancy\, and high-powered sources sustain forward shocks that continue heating their surroundings. I also find several trends in the spectral evolution of remnants that are dependent on environment properties. \n\nI further explore remnant identification using machine learning on simulated radio data\, finding that even simple models can distinguish active and remnant sources\, though younger remnants are harder to classify. Finally\, I introduce a new method to calculate radio and X-ray observables directly from simulations\, enabling detailed\, high-resolution studies of lobe emission and its interaction with the environment. \n\nThese results provide a theoretical framework to interpret current and upcoming low-frequency surveys and improve our understanding of the lifecycle and impact of RLAGN. \n\n \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-georgia-stewart-university-of-tasmania/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2026/03/talk_graphic_G_Stewart-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
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DTSTART;TZID=Australia/Sydney:20260409T120000
DTEND;TZID=Australia/Sydney:20260409T123000
DTSTAMP:20260515T125617
CREATED:20260407T021731Z
LAST-MODIFIED:20260407T021732Z
UID:18609-1775736000-1775737800@www.atnf.csiro.au
SUMMARY:Colearnium: Tessa Vernstrom (CSIRO)
DESCRIPTION:“LAMBDA project update”\n\nThis week Tessa Vernstrom will provide a “LAMBDA project update“. \n\n \n\n \n\n\n\nPlease let me know if you’re willing to present at a future co-learnium or have requests for specific talks\, thanks! \n\nKind regards\, \n\nStefan Duchesne \n\nTeams meeting link below: \nTeams Meeting\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/colearnium-tessa-vernstrom-csiro/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
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BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260423T120000
DTEND;TZID=Australia/Sydney:20260423T123000
DTSTAMP:20260515T125617
CREATED:20260420T065518Z
LAST-MODIFIED:20260420T065518Z
UID:18686-1776945600-1776947400@www.atnf.csiro.au
SUMMARY:Colearnium: Agastya Kapur (CSIRO)
DESCRIPTION:“An Introduction to Variant Sudoku”\n\nThis week Agastya Kapur will provide “An Introduction to Variant Sudoku“. \n\n \n\n \n\n\n\nPlease let me know if you’re willing to present at a future co-learnium or have requests for specific talks\, thanks! \n\nKind regards\, \n\nStefan Duchesne \n\nTeams meeting link below: \nTeams Meeting\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/colearnium-agastya-kapur-csiro-2/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260428T093000
DTEND;TZID=Australia/Sydney:20260429T163000
DTSTAMP:20260515T125617
CREATED:20260422T050724Z
LAST-MODIFIED:20260422T061936Z
UID:18706-1777368600-1777480200@www.atnf.csiro.au
SUMMARY:Bolton Symposium 2026
DESCRIPTION:About the Symposium\n\nThe Bolton Symposium\, named after the first director of Murriyang\, our Parkes radio telescope\, John Gatenby Bolton (1922-1993)\, provides a forum for early-career research (ECR) staff within the Australia Telescope National Facility to showcase their science\, and to develop and strengthen collaborations within CSIRO.  \n\nWe will hold a Bolton Symposium from April 28-29 2026 at the S&A Marsfield site\, with a theme of “Connecting Science and Technology“. This year\, the primary purpose of the symposium will be for early career staff in Science\, Technology\, and Space to become familiar with the work we collectively do and how we can contribute to the future of ATNF and CSIRO S&A.The first day of the symposium will feature an open session of research/engineering talks from ECRs/junior staff*. The second part of Day 1 and the full Day 2 will consist of a closed workshop and discussion sessions\, along with social team‑building activities. \n\nAgenda\n\nOpen session: 28 April (09:30 – 14:15 AEST)\n\nTime (AEST)TitleSpeakerSession chair09:30Marsfield morning tea10:00WelcomeAndrew Zic\, Kelly Gourdji\, Maral Ansari10:05The self calibrating radiometer and the quest for the cosmic dawnLuke McKay10:15Planet formation\, protoplanetary disks\, and Regularized Maximum Likelihood ImagingIan Czekala10:25LAMBDA: An SKA-LOW Like Station for VLBI and All-Sky ScienceJaiden Cook10:35LAMBDA VLBI ScienceEmmy Escott10:45Imaging with the Murchison Widefield ArrayStefan Duchesne10:55Solar imaging with the MWA and the technical challenges associated with itAngie Waszewski11:05Adaptive Beamforming Meets Reality: RFI Subspace Identification with PAFsLiroy Lourenço11:15-11:30Short coffee break (15 min)11:30How to (and not to) keep up-to-date with the rapidly evolving AI landscapeSamuel Lai11:40Long period transients and polarisationJosh Preston Pritchard11:50Design for manufacture (DFM) of a low-cost optical spectrometerTim Bolton12:00Time domain methods for (future) radio facilitiesAndrew Zic12:10Characterizing fast transients with ATNF facilitiesKelly Gourdji12:20Why Low-energy Radio Astronomy Matters and How We Get ThereBrian Udugama12:30-14:15Lunch\n\nClosed session: 28 April (14:15-16:00 AEST)\n\nTime (AEST)Title14:15-15:30Closed session talks + Q&A15:30-Marsfield Receiver Lab Tour\n\n\nClosed session: 29 April (09:50-16:30 AEST)\n\n\n\n\nTime (AEST)Title09:50Round table introductions10:00Lea Powys: Space Situational Awareness with ATNF Radio Telescopes10:10Discussion: LAMBDA11:10Discussion: Scaling up a mid-frequency aperture array12:10-13:00Lunch13:00Discussion: Enhancing the LBA13:30Discussion: Trash or treasure? RFI and solar mitigation14:15Discussion: Photonic backends14:45Discussion: Radio astronomy signal processing from the ground up15:15-15:30Wrap up\, next steps and conclusion16:30Social team building offsite18:00ECR Dinner\n\n\n\nVenue\n\nVenue information\n\nThe symposium open session will be held in the Marsfield Lecture Theatre. For visitor access\, please sign in at Reception. \n\nOrganisers\n\nCode of Conduct\n\nBy attending this event\, you agree to comply with the ATNF Events Code of Conduct:https://www.atnf.csiro.au/code-of-conduct/ \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/bolton-symposium-2026/
LOCATION:Marsfield Lecture Theatre\, 26 Pembroke Road\, Marsfield\, NSW\, 2122\, Australia
CATEGORIES:Meeting
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2025/05/ParkesOrionPleiades-scaled-1.jpg
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