2008MNRAS.384..692J

Query : 2008MNRAS.384..692J

2008MNRAS.384..692J - Mon. Not. R. Astron. Soc., 384, 692-700 (2008/February-3)

Radio galaxies in the 2SLAQ Luminous Red Galaxy survey - II. The stellar populations of radio-loud and radio-quiet LRGs.

JOHNSTON H.M., SADLER E.M., CANNON R., CROOM S.M., ROSS N.P. and SCHNEIDER D.P.

Abstract (from CDS):

We present an analysis of the optical spectra of a volume-limited sample of 375 radio galaxies at redshift 0.4 < z < 0.7 from the 2dF-SDSS (Sloan Digital Sky Survey) Luminous Red Galaxy (LRG) and QSO (quasi-stellar object) (2SLAQ) redshift survey. We investigate the evolution of the stellar populations and emission-line properties of these galaxies. By constructing composite spectra and comparing with a matched sample of radio-quiet sources from the same survey, we also investigate the effect on the galaxy of the presence of an active nucleus.

The composite spectra, binned by redshift and radio luminosity, all require two components to describe them, which we interpret as an old and a younger population. We found no evolution with redshift of the age of the younger population in radio galaxies, nor were they different from the radio-quiet comparison sample. Similarly, there is no correlation with radio power, with the exception that the most powerful radio sources (P_1.4> 10²⁶W/Hz) have younger stars and stronger emission lines than the less powerful sources. This suggests that we have located the threshold in radio power where strong emission lines `switch on', at radio powers of around 10²⁶W/Hz. Except for the very powerful radio galaxies, the presence of a currently active radio active galactic nucleus (AGN) does not appear to be correlated with any change in the observed stellar population of a luminous red galaxy at z ∼ 0.5.

Journal keyword(s): galaxies: active - galaxies: stellar content - cosmology: observations

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	NVSS J100322-000135	rG	10 03 22.367	-00 01 36.66			19.31			~	3	0

Query : 2008MNRAS.384..692J

Basic data :

NVSS J100322-000135 -- Radio Galaxy

Rad (NVSS,FIRST), rG (2007MNRAS)

10 03 22.367 -00 01 36.66 (Radio) [ 1000 1000 90 ] D 2015ApJ...801...26H

10 00 48.569 +00 12 55.81 [ 1000 1000 90 ]

239.805771 +41.376719 [ 1000 1000 90 ]

V(km/s) 84535 [~] / z(absorption) 0.3362 [~] / cz 100790 [~] (Opt) D 2006MNRAS.372..425C

V (AB) 19.31 [~] D 2006MNRAS.372..425C

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NVSS J100322-000135 FIRST J100322.3-000136 2SLAQ J100322.41-000137.8

References (3 between 1850 and 2026) (Total 3)
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 : NVSS J100322-000135

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NVSS J100322-000135 FIRST J100322.3-000136

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