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DTSTART;TZID=Australia/Sydney:20210512T150000
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DTSTAMP:20260515T231356
CREATED:20250819T102631Z
LAST-MODIFIED:20250820T032816Z
UID:15001-1620831600-1620835200@www.atnf.csiro.au
SUMMARY:S&A Colloquium: Guillaume Drouart (ICRAR / Curtin)
DESCRIPTION:Toward the first sample of radio powerful AGN in the EOR\n\nAbstract\n\nWith the very recent discovery of radio luminous AGN at z>6\, a new window of opportunity is finally opening in the study of the galaxy evolution at the end of the Epoch of Reionization. Our pilot programme in the 60 deg^2 GAMA-09 field uses a new selection technique taking advantage of the large frequency coverage of GLEAM by selecting compact\, steep and curved sources at low-frequency (70-230MHz). Out of four candidates\, one new powerful radio galaxy\, 0856+0224\, is confirmed at z=5.55\, finally overtaking the z=5.2 20 year-old record for distant radio galaxies (albeit just falling short of the new recent z=5.7 record). Interestingly\, 0856+0224 presents similarities with existing z<5 redshift samples\, giving confidence in the success of our selection technique. Our recent progress on a second source\, 0917-0012\, thanks to the extensive multi-wavelength coverage from follow-up observations with ALMA and JVLA\, supplemented with publicly available data\, place this source at a promising z>5. I will also discuss the refinement of our selection technique over the full 1200 deg^2 sky area covered by the ESO VIKING near-infrared survey\, leading to 55 new high-redshift candidates. This sample aims to provide us with the first statistically significant radio luminous active galactic nuclei sample at z > 6.5 during the Epoch of Reionization. The nature of radio selection presents the advantage of being insensitive to orientation-dependent obscuration\, it allows us (i) to study simultaneously the co-evolution of the supermassive black hole and host galaxy and (ii) to enable the study of the IGM through the HI absorption line. \n\nEvent details\nDownload iCal\nCategory\nColloquia
URL:https://www.atnf.csiro.au/event/sa-colloquium-guillaume-drouart-icrar-curtin/
LOCATION:NSW
CATEGORIES:Colloquia
ATTACH;FMTTYPE=image/png:https://www.atnf.csiro.au/wp-content/uploads/2024/12/Colloq-12052021.png
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