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

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

2007-11-21

arxiv.org/abs/0711.3486v1

Astronomy and Astrophysics

Astrophysics

10 pages, 10 figures and 2 tables, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12741.x

We present an analysis of the optical spectra of a volume-limited sample of 375 radio galaxies at redshift 0.4 10^26 W/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 10^26 W/Hz. Except for the very powerful radio galaxies, the presence of a currently-active radio AGN does not appear to be correlated with any change in the observed stellar population of a luminous red galaxy at z~0.5.

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