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DTSTART;TZID=Australia/Sydney:20210901T150000
DTEND;TZID=Australia/Sydney:20210901T160000
DTSTAMP:20260516T131135
CREATED:20250819T102054Z
LAST-MODIFIED:20250819T102055Z
UID:14992-1630508400-1630512000@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Christene Lynch (ICRAR/Curtin)
DESCRIPTION:The Long-Baseline Epoch of Reionisation Survey\n\nAbstract\n\nOne of the principal systematic constraints on the Epoch of Reionisation (EoR) experiment is the accuracy of the foreground calibration model. Recent results have shown that highly accurate models of extended foreground sources\, and including models for sources in both the primary beam and its sidelobes\, are necessary for reducing foreground power. To improve the source models in the EoR fields observed by the Murchison Widefield Array (MWA)\, we conducted the Long Baseline Epoch of Reionisation Survey. This survey consists of multi-frequency observations\, spanning 104 – 230 MHz\, of the MWA EoR fields and their eight neighbouring fields using the MWA Phase II extended array. These observations provide high-resolution\, (u\,v)-components to compliment the existing (u\,v)-plane sampling of these fields. Additionally\, due to the better imaging capabilities of the MWA Phase II extended array\, this survey improves upon the sensitivity of the GLEAM survey by roughly a factor of 5 in the EoR fields. This talk will present results from the first half of the LoBE survey and discuss the next steps for foreground modelling for the MWA EoR experiment. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-christene-lynch-icrar-curtin/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/jpeg:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-01092021.jpg
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DTSTART;TZID=Australia/Sydney:20210915T150000
DTEND;TZID=Australia/Sydney:20210915T160000
DTSTAMP:20260516T131135
CREATED:20250819T102033Z
LAST-MODIFIED:20250819T102034Z
UID:14991-1631718000-1631721600@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Barnali Das (NCRA-TIFR)
DESCRIPTION:What makes a living\, lazy and luminous pulsar\, a.k.a. ‘Main-sequence Radio Pulse emitter’?\n\nAbstract\n\nLiving\, lazy and luminous pulsars are magnetic early-type stars that emit periodic radio pulses\, just like a ‘normal’ pulsar; but rotating with a considerably less angular speed than that for neutron stars. We call such objects as ‘Main-sequence Radio Pulse emitters’ (MRPs). The emission mechanism behind\, the electron cyclotron maser emission (ECME)\, is the same one that also drives coherent radio emission in planets and dwarf stars. The MRPs have been assumed to be exotic objects due to their rarity for a long time (only one such object was discovered between 2000-2015)\, and why this is the case has been a mystery. In my talk\, I will describe an ongoing survey conducted with the updated Giant Metrewave Radio Telescope (uGMRT) in an effort to resolve this issue. I will present the discoveries made so far\, and an unexpected possibility that has emerged from them. \nWatch recording\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-barnali-das-ncra-tifr/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-15092021.png
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DTSTART;TZID=Australia/Sydney:20210929T150000
DTEND;TZID=Australia/Sydney:20210929T160000
DTSTAMP:20260516T131135
CREATED:20250819T102008Z
LAST-MODIFIED:20250820T032752Z
UID:14990-1632927600-1632931200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Sofia Sheikh (Penn. State)
DESCRIPTION:The Breakthrough Listen Signal-of-Interest ‘blc1’: Analysis\, Origin\, and Lessons Learned\n\nAbstract\n\nThe aim of the search for extraterrestrial intelligence (SETI) is to find technologically-capable life beyond Earth through their technosignatures. On 2019-April-29\, the Breakthrough Listen SETI project observed Proxima Centauri with the Parkes “Murriyang” radio telescope. These data contained a narrowband signal with characteristics broadly consistent with a technosignature near 982 MHz (colloquially named ‘blc1’). In this talk\, I will present the discovery and characterization of blc1 in the context of the ubiquity of human-generated radio interference. Briefly: we find that blc1 is not an extraterrestrial technosignature\, but rather an electronically-drifting intermodulation product of local\, time-varying interferers aligned with the observing cadence. We find dozens of instances of radio interference with similar morphologies to blc1 at harmonically-related frequencies to common clock oscillators. These complex intermodulation products highlight the necessity for detailed follow-up of any signal-of-interest. I will end the talk with a discussion of the necessity of signal verification procedures\, and lessons learned from this intriguing case study. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-sofia-sheikh-penn-state/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-29092021.png
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