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| Paper: |
The Cosmic Evolution of Massive Galaxies and Their Radio-Loud AGN |
| Volume: |
399, Panoramic Views of Galaxy Formation and Evolution |
| Page: |
413 |
| Authors: |
Sadler, E.M.; Johnston, H.M.; Cannon, R.D.; Mauch, T. |
| Abstract: |
The 140 deg2 2SLAQ survey carried out at the Anglo-Australian Telescope in 2003–5 obtained redshifts and spectra for more than 11,000 luminous red galaxies (LRGs) in the redshift range z = 0.4 to 0.7. By combining the 2SLAQ data with wide-field radio continuum surveys of the same area, we have measured the first accurate radio luminosity function for massive galaxies at z ∼ 0.55. Our results imply that the total energy input into massive earlytype galaxies from ‘radio-mode’ AGN heating increases with redshift, and was at least 50% higher at z ∼ 0.55 than in the local universe. With the exception of the most powerful radio sources (L1.4 > 1026 W/Hz), we find no significant difference in the stellar populations of 2SLAQ LRGs with and without a radioloud AGN. This is consistent with a picture in which radio-loud AGN occur episodically in all massive early-type galaxies. |
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