Accreting supermassive black holes in the COSMOS field and the connection to their host galaxies

被引：197

作者：

Bongiorno, A. ^{[1
,2
]}

Merloni, A. ^{[1
]}

Brusa, M. ^{[1
]}

Magnelli, B. ^{[1
]}

Salvato, M. ^{[1
]}

Mignoli, M. ^{[3
]}

Zamorani, G. ^{[3
]}

Fiore, F. ^{[2
]}

Rosario, D. ^{[1
]}

Mainieri, V. ^{[4
]}

Hao, H. ^{[5
]}

Comastri, A. ^{[3
]}

Vignali, C. ^{[3
,6
]}

Balestra, I. ^{[1
]}

Bardelli, S. ^{[3
]}

Berta, S. ^{[1
]}

Civano, F. ^{[7
]}

Kampczyk, P. ^{[8
]}

Le Floc'h, E. ^{[9
]}

Lusso, E. ^{[10
]}

Lutz, D. ^{[1
]}

Pozzetti, L. ^{[6
]}

Pozzi, F. ^{[3
]}

Riguccini, L. ^{[9
]}

Shankar, F. ^{[11
]}

Silverman, J. ^{[12
]}

机构：

[1] Max Planck Inst Extraterr Phys MPE, D-85748 Garching, Germany

[2] INAF Osservatorio Astron Roma, I-00040 Rome, Italy

[3] INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy

[4] ESO, D-85748 Garching, Germany

[5] SISSA, I-34136 Trieste, Italy

[6] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[7] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[8] ETH, Inst Astron, CH-8093 Zurich, Switzerland

[9] CEA DSM CNRS Univ Paris Diderot, IRFU, Serv Astrophys, Lab AIM,CEA Saclay, F-91191 Gif Sur Yvette, France

[10] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[11] Univ Paris Diderot, CNRS, Observ Paris, GEPI, F-92195 Meudon, France

[12] Univ Tokyo, IPMU, Kashiwa, Chiba 2778568, Japan

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 427卷 / 04期

基金：

美国国家航空航天局;

关键词：

catalogues; surveys; galaxies: active; galaxies: evolution; galaxies: fundamental parameters; ACTIVE GALACTIC NUCLEI; STAR-FORMING GALAXIES; SPECTRAL ENERGY-DISTRIBUTIONS; SIMILAR-TO; AGN LUMINOSITY FUNCTION; EVOLUTION SURVEY COSMOS; HIGH-REDSHIFT GALAXIES; STELLAR MASS DENSITY; GOODS-MUSIC SAMPLE; X-RAY SURVEYS;

D O I：

10.1111/j.1365-2966.2012.22089.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the wide multiband photometry available in the Cosmic Evolution Survey (COSMOS) field, we explore the host galaxy properties of a large sample of active galactic nuclei (AGNs; similar to 1700 objects) with L-bol ranging from 10(43) to 10(47) erg s(-1), obtained by combining X-ray and optical spectroscopic selections. Based on a careful study of their spectral energy distributions, which have been parametrized using a two-component (AGN+galaxy) model fit, we have derived dust-corrected rest-frame magnitudes, colours and stellar masses of the obscured and unobscured AGN hosts up to high redshift (z less than or similar to 3). Moreover, for the sample of obscured AGNs, we have also derived reliable star formation rates (SFRs). We find that AGN hosts span a large range of stellar masses and SFRs. No colour-bimodality is seen at any redshift in the AGN hosts, which are found to be mainly massive, red galaxies. Once we have accounted for the colour-mass degeneracy in well-defined mass-matched samples, we find a residual (marginal) enhancement of the incidence of AGNs in redder galaxies with lower specific SFRs. We argue that this result might emerge because of our ability to properly account for AGN light contamination and dust extinction, compared to surveys with a more limited multiwavelength coverage. However, because these colour shifts are relatively small, systematic effects could still be considered responsible for some of the observed trends. Interestingly, we find that the probability for a galaxy to host a black hole that is growing at any given 'specific accretion rate' (i.e. the ratio of X-ray luminosity to the host stellar mass) is almost independent of the host galaxy mass, while it decreases as a power law with L-X/M-*. By analysing the normalization of such a probability distribution, we show how the incidence of AGNs increases with redshift as rapidly as (1 + z)(4), which closely resembles the overall evolution of the specific SFR of the entire galaxy population. We provide analytical fitting formulae that describe the probability of a galaxy of any mass (above the completeness limit of the COSMOS) to host an AGN of any given specific accretion rate as a function of redshift. These can be useful tools for theoretical studies of the growing population of black holes within galaxy evolution models. Although AGN activity and star formation in galaxies do appear to have a common triggering mechanism, at least in a statistical sense, within the COSMOS sample, we do not find any conclusive evidence to suggest that AGNs have a powerful influence on the star-forming properties of their host galaxies.

引用

页码：3103 / 3133

页数：31

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