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16 April 2024

» arxiv » astro-ph/0612019

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Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey: I. The evolution of low-power radio galaxies to z~0.7
Elaine M. Sadler ; Russell D. Cannon ; Tom Mauch ; Paul J. Hancock ; David A. Wake ; Nic Ross ; Scott M. Croom ; Michael J. Drinkwater ; Alastair C. Edge ; Daniel Eisenstein ; Andrew M. Hopkins ; Helen Johnston ; Robert Nichol ; Kevin A. Pimbblet ; Roberto De Propris ; Isaac G. Roseboom ; Donald P. Schneider ; Tom Shanks ;
Date:	1 Dec 2006
Abstract:	We have combined optical data from the 2dF-SDSS Luminous Red Galaxy and QSO (2SLAQ) redshift survey with radio measurements from the 1.4 GHz VLA FIRST and NVSS surveys to identify a volume-limited sample of 391 radio galaxies at redshift 0.4<z<0.7. By determining an accurate radio luminosity function for early-type galaxies in this redshift range, we can investigate the cosmic evolution of the radio-galaxy population over a wide range in radio luminosity. We find that low-power radio galaxies (those with 1.4 GHz radio luminosities in the range 10^{24} to 10^{25} W/Hz, corresponding to FR I radio galaxies in the local universe) undergo significant cosmic evolution over the redshift range 0<z<0.7, consistent with pure luminosity evolution of the form (1+z)^k, where k=2.0+/-0.3. Our results appear to rule out (at the 6-7 sigma level) models in which low-power radio galaxies undergo no cosmic evolution. The most powerful radio galaxies in our sample (with radio luminosities above 10^{26} W/Hz) appear to undergo more rapid evolution over the same redshift range. The evolution seen in the low-power radio-galaxy population implies that the total energy input into massive early-type galaxies from AGN heating increases with redshift, and was roughly 50% higher at z~0.55 (and up to a factor of two higher at z~1) than in the local universe.
Source:	arXiv, astro-ph/0612019
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