Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey - 1. The evolution of the low-power radio galaxies to z ~ 0.7

Sadler, E. M., Cannon, R. D., Mauch, T., Hancock, P. J., Wake, D. A., Ross, N., Croom, S. M., Drinkwater, M. J., Edge, A. C., Eisenstein, D., Hopkins, A. M., Johnston, H. M., Nichol, R., Pimbblet, K. A., De Propris, R., Roseboom, I., Schneider, D. P. and Shanks, T. (2007) Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey - 1. The evolution of the low-power radio galaxies to z ~ 0.7. Monthly Notices of the Royal Astronomical Society, 381 1: 211-227. doi:10.1111/j.1365-2966.2007.12231.x

Author Sadler, E. M.
Cannon, R. D.
Mauch, T.
Hancock, P. J.
Wake, D. A.
Ross, N.
Croom, S. M.
Drinkwater, M. J.
Edge, A. C.
Eisenstein, D.
Hopkins, A. M.
Johnston, H. M.
Nichol, R.
Pimbblet, K. A.
De Propris, R.
Roseboom, I.
Schneider, D. P.
Shanks, T.
Title Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey - 1. The evolution of the low-power radio galaxies to z ~ 0.7
Formatted title

Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 0035-8711
Publication date 2007-10
Year available 2007
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2007.12231.x
Open Access Status DOI
Volume 381
Issue 1
Start page 211
End page 227
Total pages 17
Editor Fabian, A. C.
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2008
Language eng
Abstract We have combined optical data from the 2dF-SDSS (Sloan Digital Sky Survey) LRG (Luminous Red Galaxy) and QSO (quasi-stellar object) (2SLAQ) redshift survey with radio measurements from the 1.4 GHz VLA (Very Large Array) FIRST (Faint Images of the Radio Sky at Twenty-cm) and NVSS (NRAO VLA Sky Survey) 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 luminous 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. The low-power radio galaxies in our LRG sample (those with 1.4 GHz radio luminosities in the range 1024 to 1025 W Hz−1, corresponding to Fanaroff–Riley I (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 6–7σ level) models in which low-power radio galaxies undergo no cosmic evolution. The most powerful radio galaxies in our sample (with radio luminosities above 1026 W Hz−1) may 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 active galactic nucleus (AGN) heating increases with redshift, and was at least 50 per cent higher at z 0.55 (the median redshift of the 2SLAQ LRG sample) than in the local universe. This article is cited by:
Keyword Galaxies : Active
Galaxies : Luminosity Function, Mass Function
Radio Continuum : Galaxies
Active Galactic Nuclei
Star-forming Galaxies
20-cm Vla Survey
Abell Clusters
Cosmological Evolution
Formation Histories
Q-Index Code C1

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