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Quasars Do Not Live in Merging Systems: No Enhanced Merger Rate at z≲0.8

Published online by Cambridge University Press:  03 June 2010

Mauricio Cisternas ,
Knud Jahnke  and
Katherine J. Inskip
Mauricio Cisternas
Affiliation:
MPIA, Königstuhl 17, D-69126 Heidelberg, Germany Email: [email protected]
Knud Jahnke
Affiliation:
MPIA, Königstuhl 17, D-69126 Heidelberg, Germany Email: [email protected]
Katherine J. Inskip
Affiliation:
MPIA, Königstuhl 17, D-69126 Heidelberg, Germany Email: [email protected]
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We tackle the long-standing question “what is the relevance of major mergers and interactions as triggering mechanisms for AGN activity?” We study a sample of 83 quasars over z ~ 0.3–1.0 with high-resolution HST/ACS imaging in the F814W (broad I) band in the COSMOS field (Scoville et al. 2007), detected by their X-ray emission in the XMM-Newton survey (Hasinger et al. 2007). We perform a visual analysis of their morphologies, looking for signatures of merging and interactions in their host galaxies that could potentially be related to the AGN fueling mechanism. To get the best possible picture of the host galaxies, we remove the bright quasar by modeling each of them as a Sersic surface brightness profile plus a central point source, through a 2-D parametric fit.

Keywords

galaxies: activegalaxies: interactionsquasars: general
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. 326
Copyright
Copyright © International Astronomical Union 2010

References

Hasinger, G. 2008, A&A, 490, 905Google Scholar
Hasinger, G., et al. 2007, ApJS, 172, 29CrossRefGoogle Scholar
Scoville, N., et al. 2007, ApJS, 172, 38CrossRefGoogle Scholar