2007MNRAS.375.1349C

Query : 2007MNRAS.375.1349C

2007MNRAS.375.1349C - Mon. Not. R. Astron. Soc., 375, 1349-1363 (2007/March-2)

The 6C** sample of steep-spectrum radio sources - II. Redshift distribution and the space density of high-redshift radio galaxies.

CRUZ M.J., JARVIS M.J., RAWLINGS S. and BLUNDELL K.M.

Abstract (from CDS):

We use the 6C** sample to investigate the comoving space density of powerful, steep-spectrum radio sources. This sample, consisting of 68 objects, has virtually complete K-band photometry and spectroscopic redshifts for 32 per cent of the sources. In order to find its complete redshift distribution, we develop a method of redshift estimation based on the K-z diagram of the 3CRR, 6CE, 6C* and 7CRS radio galaxies. Based on this method, we derive redshift probability density functions for all the optically identified sources in the 6C** sample. Using a combination of spectroscopic and estimated redshifts, we select the most radio luminous sources in the sample. Their redshift distribution is then compared with the predictions of the radio luminosity function of Jarvis et al. We find that, within the uncertainties associated with the estimation method, the data are consistent with a constant comoving space density of steep-spectrum radio sources beyond z ≳ 2.5, and rule out a steep decline.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): galaxies: active - galaxies: evolution - quasars: general - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/375/1349): table1.dat>

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 5C 7.178 rG 08 21 49.60320 +29 22 44.5368           ~ 6 0

Query : 2007MNRAS.375.1349C

Basic data :
5C 7.178 -- Radio Galaxy
Other object types: otypes_help 		rG (2018ApJ,[C2007]), Rad (5C), Opt (SDSS)
ICRS coord. (ep=J2000) : 		08 21 49.60320 +29 22 44.5368 (Optical) [ ] C 2020ApJS..249....3A
FK4 coord. (ep=B1950 eq=1950) : 		08 18 44.98007 +29 32 20.3295 [ ]
Gal coord. (ep=J2000) : 		193.49210058 +31.44610347 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 64893 [~] / z(~) 0.246 [~] / cz 73749 [~]
   D 2002MNRAS.335.1120W
Fluxes (4) :
g (AB) 21.573 [0.083] C 2020ApJS..249....3A
r (AB) 20.706 [0.062] C 2020ApJS..249....3A
i (AB) 20.275 [0.062] C 2020ApJS..249....3A
z (AB) 20.443 [0.287] D 2020ApJS..249....3A
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Identifiers (3) :
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5C 7.178 SDSS J082149.60+292244.5 [C2007] J0821+2922

References (6 between 1850 and 2026) (Total 6)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Data at NED - NASA/IPAC Extragalactic Database : 5C 7.178

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5C 7.178 SDSS J082149.60+292244.5

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