BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Australia Telescope National Facility - ECPv6.16.2//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Australia Telescope National Facility
X-ORIGINAL-URL:https://www.atnf.csiro.au
X-WR-CALDESC:Events for Australia Telescope National Facility
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Australia/Sydney
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20240406T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20241005T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20250405T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20251004T160000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+1100
TZOFFSETTO:+1000
TZNAME:AEST
DTSTART:20260404T160000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+1000
TZOFFSETTO:+1100
TZNAME:AEDT
DTSTART:20261003T160000
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251105T150000
DTEND;TZID=Australia/Sydney:20251105T160000
DTSTAMP:20260517T045633
CREATED:20251103T032208Z
LAST-MODIFIED:20251103T032208Z
UID:16080-1762354800-1762358400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Michael Busch (NRAO)
DESCRIPTION:OH as a Tracer of “CO-Dark” Gas in the Interstellar Medium Near and Far\n\nAbstract: \n\nMolecular clouds are the birthplace of stars. It is unfortunate then that the most abundant interstellar molecule\, molecular hydrogen (H2)\, is practically invisible in cold molecular clouds (T<100K). Astronomers typically use the second most abundant molecule\, carbon monoxide (CO)\, to trace the bulk distribution of H2 in our galaxy and many others because of its relative brightness and abundance. CO observations alone\, however\, fail to trace a significant amount of molecular gas\, known as “CO-dark” molecular gas. In this talk\, I will review the observational evidence for the existence of a significant amount of “CO-dark” gas in the galaxy\, then recount the efforts in the 2010s to use OH with the Green Bank Telescope (GBT) to observe the “CO-dark” gas in the Outer galaxy (Busch et al. 2019\, 2021). Then I will present recent results on an extremely sensitive pilot survey for 18cm OH emission towards the southern disk of the Andromeda Galaxy\, in which trace the large-scale galactic “CO-Dark” molecular gas with the GBT (Busch 2024). A follow-up Andromeda survey is presented. I will discuss recent efforts in combining HCO+ absorption in the diffuse ISM with OH emission to understand the properties of diffuse molecular gas in the ISM and conclude on future work with collaborators in Australia regarding OH as a tracer of “CO-dark” gas. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-michael-busch-nrao/
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/2025/11/ColumnDensityHNucleiM31.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251106T120000
DTEND;TZID=Australia/Sydney:20251106T123000
DTSTAMP:20260517T045633
CREATED:20250923T033638Z
LAST-MODIFIED:20250923T050121Z
UID:15728-1762430400-1762432200@www.atnf.csiro.au
SUMMARY:Colearnium: Duy Nguyen (CSIRO)
DESCRIPTION:A Single-Chip Wideband Digital Receiver for the Australia Telescope Compact Array Upgrade\n\nThis week Duy Nguyen will present on “Modernizing Legacy: Wrapping a 25+ Year Computational Fluid Dynamics Codebase“. \n\n\n\nModernizing Legacy: Wrapping a 25+ Year Computational Fluid Dynamics Codebase \n\nAuthors: Duy Nguyen\, Tisham Dhar\, Peter Wang\, Jean-Michel Perraud\, Klaus Joehnk.Computational Fluid Dynamics (CFD) is the science of using numerical analysis and data structures to solve many processes influencing fluid behavior. CFD requires many complex mathematical representations through various ODE and PDE solvers\, and has traditionally been written in Fortran or C++\, mostly for their speed in doing massively parallel computations\, such as handling array operations and object-oriented features. As such\, those codebases have a long-standing legacy in scientific computing\, and many established CFD codes are written in them. However\, as time goes on\, we witness the popularity of a new generation of codebases such as Python\, which stems from its simplicity\, versatility\, and strong community. Extensive libraries and frameworks make Python a popular choice for many developers and scientists alike. It is\, however\, not a preferred language for core CFD code due to performance limitations and its difficulties with parallelization. This talk explores modernizing a 25+ year-old C++ CFD model\, essential for simulating lake conditions\, particularly for predicting temperature variations and algal bloom dynamics\, by wrapping it with [C-interop] for seamless Python interoperability. Beyond integration\, we leverage [Optuna]\, a powerful hyperparameter optimization framework\, to fine-tune models efficiently\, transitioning from manual parameter tuning on a laptop to a distributed\, scalable workflow powered by Dask Distributed and JupyterHub. This transformation enables automated hyperparameter optimization across many lakes in Australia\, helping researchers investigate trends in tuning parameters and derive deeper environmental insights.Attendees will gain insights into:– Wrapping legacy C++ water quality models with CFFI for Python-driven analysis.– Automating and scaling hyperparameter tuning using Optuna across multiple lake ecosystems.– Utilizing Dask Distributed and JupyterHub to accelerate environmental simulations.– Extracting insights from hyperparameter trends to refine large-scale water quality predictions. For researchers\, engineers\, and data scientists working in environmental modeling\, this session provides practical strategies for modernizing legacy systems\, scaling model optimization\, and enhancing predictive accuracy without sacrificing scientific integrity. \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\nSamuel (On behalf of the co-learnium organisers) \n\nTeams meeting link below: \nTeams Meeting\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/colearnium-duy-nguyen-csiro/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251112T150000
DTEND;TZID=Australia/Sydney:20251112T160000
DTSTAMP:20260517T045633
CREATED:20251110T011649Z
LAST-MODIFIED:20251110T011650Z
UID:16115-1762959600-1762963200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Dan Rybarczyk (University of Wisconsin-Madison)
DESCRIPTION:New constraints on CO-dark molecular gas properties in the diffuse ISM: Insights from 21cm and 3mm absorption observations\n\nAbstract: \n\nThe evolution of the multiphase interstellar medium (ISM) drives galaxy evolution. The transition from diffuse atomic gas to denser molecular clouds sets the initial conditions for star formation\, so plays a critical role in this evolution. However\, since molecular hydrogen (H2) is invisible in many diffuse environments\, observational constraints on the atomic-to-molecular transition remain limited. CO emission is often used to trace H2\, but in the diffuse ISM\, a significant fraction of H2 is not associated with any CO emission (the “CO-dark” molecular gas). Thankfully\, HCO+ absorption at 3mm is an excellent tracer of diffuse molecular gas — with a stable abundance and formation/survival at low column density\, HCO+ is a reliable probe of the H2 column density in the diffuse ISM. Here we report observations of HI\, HCO+\, and CO in absorption toward five diffuse lines of sight. In all of these directions\, we detect a kinematically broad\, CO-dark signature in HCO+ absorption that is associated with nearly all the cold atomic gas in these directions. We constrain the CO abundances in these directions\, which are consistent with chemical model predictions and account for the non-detection of CO. In fact\, we show that CO emission or absorption are unlikely to be detected where N(H2) < 7E19 cm^-2\, while HCO+ absorption is readily detected for N(H2) > ~fewE18 cm^-2\, opening an important window on the HI-to-H2 transition. The diffuse\, CO-dark gas associated with broad HCO+ absorption has systematically different properties\, including a lower fraction of cold atomic gas and a lower molecular fraction\, than CO-bright gas. These observations therefore offer insights on the HI-to-H2 transition that are inaccessible with CO observations.  I will briefly discuss future work aimed at uncovering the spatial structure of this diffuse\, partially-molecular gas — key to understanding the physics of this critical stage of galaxy evolution. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-dan-rybarczyk-university-of-wisconsin-madison/
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/2025/11/3C111_absorption.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251118T150000
DTEND;TZID=Australia/Sydney:20251118T160000
DTSTAMP:20260517T045633
CREATED:20251116T222856Z
LAST-MODIFIED:20251116T222856Z
UID:16142-1763478000-1763481600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jordan Collier (Australian SKA Regional Centre)
DESCRIPTION:Science with the AusSRC: Building on the Precursors Towards the SKA\n\nAbstract: \n\nThe Australian SKA Regional Centre (AusSRC) is Australia’s portion of the international SKA Regional Centre Network (SRCNet)\, which aims to establish and build capability to support the Australian and international SKA science communities\, thereby ushering in the next era of astronomical discovery and advanced data processing.  This presentation will cover AusSRC’s science support\, with highlights from our current SRCNet activities and current round of Australian SKA precursor support\, including visibility compression\, and the development and implementation of science workflows for representative SKA science\, with particular focus on visualisation and analysis capabilities within the Cube Analysis and Rendering Tool for Astronomy (CARTA). A summary will be presented of our future plans\, in transitioning toward supporting SKA science verification. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-jordan-collier-australian-ska-regional-centre/
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/2025/11/image-2025-9-10_22-14-11-scaled.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251120T120000
DTEND;TZID=Australia/Sydney:20251120T123000
DTSTAMP:20260517T045633
CREATED:20251014T014747Z
LAST-MODIFIED:20251118T071209Z
UID:15943-1763640000-1763641800@www.atnf.csiro.au
SUMMARY:Colearnium: Sander Voss (CSIRO)
DESCRIPTION:MiniXRF: Developing a Lunar X-Ray Fluorescence payload for small platforms\n\nThis week Sander Voss will present on “MiniXRF: Developing a Lunar X-Ray Fluorescence payload for small platforms“. \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\nSamuel (On behalf of the co-learnium organisers) \n\nTeams meeting link below: \nTeams Meeting\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/colearnium-sander-voss-csiro/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251121T080000
DTEND;TZID=Australia/Sydney:20251216T170000
DTSTAMP:20260517T045633
CREATED:20251203T010158Z
LAST-MODIFIED:20251203T010415Z
UID:16319-1763712000-1765904400@www.atnf.csiro.au
SUMMARY:Apply for the 2026APR semester
DESCRIPTION:Overview\n\nWe’re pleased to announce that proposals for ATNF observing time are now open for the 2026APR semester. Grab your chance to use some of our new receivers and facilities. \n\nApply now for: \n\n\nOur ASKAP radio telescope (including CRACO)\n\n\n\nOur Australia Telescope Compact Array\n\n\n\nMurriyang\, our 64-m Parkes radio telescope\n\n\n\nThe Tidbinbilla radio antennas: the 70-m antenna Ballima (DSS-43) \, and the 34-m (DSS-34) antenna;\n\n\n\nThe Long Baseline Array\n\n\nMark your calendars: the deadline for all proposals is 06:00 UT (17:00 Sydney local time) on Tuesday\, 16 December 2025. \n\nTo submit your proposal\, visit our online proposal application system\, OPAL. \nMore information\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/apply-for-the-2026apr-semester/
LOCATION:NSW
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/09/E9A915740-OBERSVERS-6-scaled.jpg
ORGANIZER;CN="George Hobbs":MAILTO:george.hobbs@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251121T110000
DTEND;TZID=Australia/Sydney:20251121T120000
DTSTAMP:20260517T045633
CREATED:20251117T221855Z
LAST-MODIFIED:20251120T051718Z
UID:16167-1763722800-1763726400@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Anna Ivleva (Observatory of Munich / Ludwig Maximilian University)
DESCRIPTION:Odd Radio Circles (ORCs): probing radio features at group scales with simulations\n\nAbstract: \n\nExtragalactic radio astronomy has proven to be immensely useful in the study of high energy particle physics by constraining the acceleration of cosmic ray electrons and their subsequent synchrotron emission. Investigations of galaxy clusters have shown to be particularly fruitful\, since such massive environments grant favourable conditions for efficient particle acceleration via merger driven shocks. Yet\, a new class of radio objects discovered only a few years ago imposes the question if also merger shocks in less massive systems can accelerate CR electrons to GeV energies. Specifically\, a growing number of observations is pointing towards the existence of ringlike features around small galaxy groups  and even Milky Way-like objects\, accordingly titled Odd Radio Circles (ORCs). Recent works have proposed that these could be interpreted as radio analogs to the merger shocks observed in more massive systems. However\, ORCs are appearing in a colder and less magnetized medium than the radio features in galaxy clusters\, challenging particle acceleration  mechanisms in more constraining environments. Now\, by interpreting multiple observed ORCs at different stages as an evolutional time sequence and comparing them to simulations of such systems\, one can infer underlying properties of these unique features\, while simultaneously testing the limits of diffusive shock acceleration (DSA). To this end\, I will present the first of its kind magnetohydrodynamical simulation of a galaxy group\, utilising on-the-fly treatment of spectral cosmic rays. I will study the emerging radio features and discuss both similarities and differences to the observed counterparts. Finally\, I will review the relative importance of DSA in the formation of ORCs compared to galactic sources of high energy particles\, such as supernovae and AGN. \nJoin Event on Microsoft Teams\nLocation\n\nOrganiser\n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-anna-ivleva-observatory-of-munich-ludwig-maximilian-university/
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/2025/11/talk_graphic.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251126T150000
DTEND;TZID=Australia/Sydney:20251126T160000
DTSTAMP:20260517T045633
CREATED:20251123T222415Z
LAST-MODIFIED:20251123T222416Z
UID:16208-1764169200-1764172800@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Jennifer West (Dominion Radio Astrophysical Observatory)
DESCRIPTION:Is the heliopause seen in radio synchrotron emission?\n\nAbstract: \n\nDiffuse radio synchrotron emission originating in the Milky Way fills the entire sky\, even at high Galactic latitudes. The emission is highly linearly polarised\, and comes from high energy CRs moving in the Galaxy’s magnetic field. Planck has measured the orientation of this emission and has mapped the magnetic field pattern across the sky\, however\, we do not know if the origin of the pattern is distant (tracing the large-scale magnetic field) or nearby (tracing the Local Bubble\, a massive superbubble where our Sun now resides). The reality is the emission must originate at a wide range of distances. In this talk\, I will present evidence that some of this emission has its origin in the interaction between the heliopause and the very local interstellar magnetic field. The emission is polarised\, and traces the local interstellar magnetic field as it wraps around the heliosphere at the heliopause boundary\, which is related to the Sun’s motion through space\, and which has previously been revealed through a bright ribbon of emission detected by NASA’s Interstellar Boundary Explorer (IBEX). \n\nPlease note that the event timezone is AEDT (UTC+11 hrs) \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-jennifer-west-dominion-radio-astrophysical-observatory/
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/2025/11/PastedGraphic-1.png
ORGANIZER;CN="Jishnu Thekkeppattu":MAILTO:Jishnunambissan.Thekkeppattu@csiro.au
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20251127T120000
DTEND;TZID=Australia/Sydney:20251127T123000
DTSTAMP:20260517T045633
CREATED:20251125T024527Z
LAST-MODIFIED:20251125T024528Z
UID:16229-1764244800-1764246600@www.atnf.csiro.au
SUMMARY:Colearnium: Adriana Parra Ruiz (CSIRO)
DESCRIPTION:‘Artificial Intelligence in 2030 and beyond’: lessons from the Science and Technology in Society forum\n\nThis week Adriana Parra Ruiz will present on “‘Artificial Intelligence in 2030 and beyond’: lessons from the Science and Technology in Society forum“. \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-adriana-parra-ruiz-csiro/
LOCATION:NSW
CATEGORIES:Colearnia
ORGANIZER;CN="Stefan Duchesne":MAILTO:Stefan.Duchesne@csiro.au
END:VEVENT
END:VCALENDAR