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Radio-Mode Feedback in Massive Galaxies at Redshift 0 < z < 1

Published online by Cambridge University Press:  03 June 2010

Elaine M. Sadler ,
Scott M. Croom ,
John H. Y. Ching ,
Helen M. Johnston ,
Russell D. Cannon  and
Tom Mauch
Elaine M. Sadler
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia Email: [email protected]
Scott M. Croom
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia Email: [email protected]
John H. Y. Ching
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia Email: [email protected]
Helen M. Johnston
Affiliation:
Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia Email: [email protected]
Russell D. Cannon
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia
Tom Mauch
Affiliation:
Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK
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Abstract

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We have carried out a large observational study of the radio luminosities, stellar populations, and environments of massive galaxies over the redshift range 0 < z < 1. Radio jets powered by an accreting central black hole are common in massive galaxies, and there is a large class of “optically quiet AGN,” with radio emission but no optical/IR signature of black-hole accretion. The central black holes in these galaxies are probably accreting in a radiatively inefficient mode, and our results suggest that “radio-mode feedback” as described by Croton et al. is likely to occur in all masssive early-type galaxies at z < 0.8. While it appears that radio-loud AGN occur episodically in all massive early-type galaxies, we also identify a sub-population of galaxies with powerful radio sources and a prominent younger (~ 108 yr) stellar population that may have undergone recent mergers.

Keywords

galaxies: activegalaxies: evolutionradio continuum: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S267: Co-Evolution of Central Black Holes and Galaxies , August 2009 , pp. 377 - 382
Copyright
Copyright © International Astronomical Union 2010

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