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SUMMARY:The GLEAM 4-Jy (G4Jy) Sample: the brightest radio-sources in the s
 outhern sky - Sarah White (Rhodes University)
DTSTART:20200708T100000Z
DTEND:20200708T103000Z
UID:TALK149572@talks.cam.ac.uk
CONTACT:Will Handley
DESCRIPTION:Powerful radio-galaxies feature heavily in our understanding o
 f galaxy evolution. However\, when it comes to studying their properties a
 s a function of redshift and/or environment\, the most-detailed studies te
 nd to be limited by small-number statistics. In this talk\, I will present
  a new sample of ~2\,000 of the brightest radio-sources in the southern sk
 y (Dec. < 30 deg). These were observed at low radio-frequencies as part of
  the GaLactic and Extragalactic All-sky MWA (GLEAM) survey\, conducted usi
 ng the Murchison Widefield Array (MWA). This instrument is the precursor t
 elescope for the low-frequency component of the Square Kilometre Array (SK
 A)\, and allows us to select radio galaxies in an orientation-independent 
 way (i.e.  minimising the bias caused by Doppler boosting\, inherent in hi
 gh-frequency surveys). Being brighter than 4 Jy at 151 MHz\, we refer to t
 hese objects as the GLEAM 4-Jy (G4Jy) Sample (White et al.\, 2020a\, 2020b
 ). Following repeated visual inspection (using multi-wavelength informatio
 n) and thorough checks against the literature\, the G4Jy catalogue is now 
 publicly available (see https://github.com/svw26/G4Jy)\, and includes mid-
 infrared identifications for 86% of the sources. Of the remaining G4Jy sou
 rces\, 140 have been followed-up using Open Time on MeerKAT (the precursor
  telescope for SKA-Mid)\, and I will present a few of the resulting images
 . The main aim is to identify the radio core (and subsequently the galaxy 
 that is hosting the radio emission)\, as existing radio images are of poor
  resolution. With over 10 times as many sources as the best-studied\, low-
 frequency radio-source sample that is optically complete (the revised Thir
 d Cambridge Catalogue of Radio Sources\; 3CRR)\, the G4Jy Sample will allo
 w models of powerful active galactic nuclei to be tested more robustly.
LOCATION:Battcock Tea area
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