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Obscured quasars: the link between star-formation and black hole activity

Published online by Cambridge University Press:  21 March 2013

Vincenzo Mainieri ,
Angela Bongiorno  and
the COSMOS team
Vincenzo Mainieri
Affiliation:
ESO, Karl-Schwarschild-Strasse 2, D–85748 Garching bei München, Germany email: vmainier@eso.org
Angela Bongiorno
Affiliation:
INAF–Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio-Catone, Italy
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Abstract

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We explore the connection between black hole growth at the center of obscured quasars selected from the XMM-COSMOS survey and the physical properties of their host galaxies. We study a bolometric regime (<Lbol> ∼ 8 × 1045 erg s−1) where several theoretical models invoke major galaxy mergers as the main fueling channel for black hole accretion. To derive robust estimates of the host galaxy properties, we use an SED fitting technique to distinguish the AGN and host galaxy emission. We find that at z ∼ 1, ≈ 62% of Type-2 QSOs hosts are actively forming stars and that their rates are comparable to those measured for normal star-forming galaxies. The fraction of star-forming hosts increases with redshift: ≈ 71% at z ∼ 2, and 100% at z ∼ 3. We also find that the evolution from z ∼ 1 to z ∼ 3 of the specific star-formation rate of the Type-2 QSO hosts is in excellent agreement with that measured for star-forming galaxies.

Keywords

galaxies: active — quasars: general — X-rays: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 181 - 183
Copyright
Copyright © International Astronomical Union 2013

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