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The GLEAM 4-Jy (G4Jy) Sample: the brightest radio-sources in the southern sky

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  • UserSarah White (Rhodes University)
  • ClockWednesday 08 July 2020, 11:00-11:30
  • HouseBattcock Tea area.

If you have a question about this talk, please contact Will Handley.

Powerful radio-galaxies feature heavily in our understanding of galaxy evolution. However, when it comes to studying their properties as a function of redshift and/or environment, the most-detailed studies tend 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 sky (Dec. < 30 deg). These were observed at low radio-frequencies as part of the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, conducted using the Murchison Widefield Array (MWA). This instrument is the precursor telescope for the low-frequency component of the Square Kilometre Array (SKA), and allows us to select radio galaxies in an orientation-independent way (i.e. minimising the bias caused by Doppler boosting, inherent in high-frequency surveys). Being brighter than 4 Jy at 151 MHz, we refer to these objects as the GLEAM 4 -Jy (G4Jy) Sample (White et al., 2020a, 2020b). Following repeated visual inspection (using multi-wavelength information) and thorough checks against the literature, the G4Jy catalogue is now publicly available (see, and includes mid-infrared identifications for 86% of the sources. Of the remaining G4Jy sources, 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 Third Cambridge Catalogue of Radio Sources; 3CRR), the G4Jy Sample will allow models of powerful active galactic nuclei to be tested more robustly.

This talk is part of the Cavendish Astrophysics Coffee talks series.

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