The Cosmic Evolution of Massive Galaxies and Their Radio-Loud AGN

Details The Cosmic Evolution of Massive Galaxies and Their Radio-Loud AGN The Cosmic Evolution of Massive Galaxies and Their Radio-Loud AGN

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..413s&link_type=abstract

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece

Astronomy and Astrophysics

Astronomy

Scientific paper

The 140 deg^2 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 early-type 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 (L_{1.4}>10^{26} W/Hz), we find no significant difference in the stellar populations of 2SLAQ LRGs with and without a radio-loud AGN. This is consistent with a picture in which radio-loud AGN occur episodically in all massive early-type galaxies.

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