A sample of 669 ultra steep spectrum radio sources to find high redshift radio galaxies

By C. De Breuck, W. Breugel, Huub RottgeringGeorge Miley. 2000

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Since radio sources with Ultra Steep Spectra (USS; . 1:30;S / ) are ecient tracers of high redshift radio galaxies (HzRGs), we have dened three samples of such USS sources using the recently com- pleted WENSS, TEXAS, MRC, NVSS and PMN radio- surveys. Our combined sample contains 669 sources with S1400 > 10 mJy and covers virtually the entire sky outside the Galactic plane (jbj > 15). For our 2 largest samples, covering > 35, we selected only sources with angu- lar sizes 0: 1J y toS1400 > 2:5 Jy. The identica- tion fraction of our USS sources on the POSS (R. 20) is as low as 15%, independent of spectral index < 1:30. We further show that 85% of the USS sources that can be identied with an X-ray source are probably contained in galaxy clusters, and that < 1:6 sources are excel- lent Galactic pulsar candidates, because the percentage of these sources is four times higher in the Galactic plane. Our sample has been constructed to start an intensive campaign to obtain a large sample of high redshift objects

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

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SUMSS: a wide-field radio imaging survey of the southern sky – II. The source catalogue (2003, background): “The overall median spectral index is −0.83, which is consistent with previous determinations of spectral index at frequencies below 1.4 GHz (Oort, Steemers & Windhorst 1988; Hunstead 1991; De Breuck et al. 2000).”
The radio luminosity function from the low-frequency 3CRR, 6CE and 7CRS complete samples (2000, methodology): “This is being attempted by several groups using spectral index and/or linear size criteria (e.g. Bremer et al. 1998; Blundell et al. 1998; Rawlings et al. 1998; De Breuck et al. 2000).”
Protoclusters associated with z > 2 radio galaxies - I. Characteristics of high redshift protoclusters (2006, methodology): “…angles: Best et al. (1999) (1602), Pentericci et al. (2000b) (2048), Pentericci et al.(1997) (1138), Kapahi et al. (1998) (0052), Pentericci et al. (1999) (0943), Carilli et al. (1997) (0316), De Breuck et al. (2000) (2009, 1338 and 0924). c The halo of TN J2009–3040 is circular. lowing discussion.”
FIRST SEASON MWA EOR POWER SPECTRUM RESULTS AT REDSHIFT 7 (2016, background): “All other sources were given a spectral index of −0.8, the previously determined median spectral index of sources below 1.4 GHz (Oort et al. 1988; Hunstead 1991; De Breuck et al. 2000; Mauch et al. 2003).”
The VLA Low-Frequency Sky Survey (2005, background): “These include halos and relics in clusters of galaxies (Ensslin & Röttgering 2002), fossil radio galaxies (Slee et al. 2001), high-redshift radio galaxies (Chambers et al. 1987; De Breuck et al. 2000), and pulsars.”
Distant radio galaxies and their environments (2008, background): “The first step (e.g. Röttgering et al 1994; Blundell et al 1998; De Breuck et al 2000, 2004) is to filter out probable HzRGs from the huge number of radio sources contained in low-frequency radio surveys (e.g. Condon et al 1998).”