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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Black hole mass and eddington ratio distribution functions of X-ray-selected broad-line AGNs at z ∼ 1.4 in the Subaru XMM-Newton Deep Field
Astrophysical Journal, Volume 761, No. 2, Article 143, Year 2012
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Description
In order to investigate the growth of supermassive black holes (SMBHs), we construct the black hole mass function (BHMF) and Eddington ratio distribution function (ERDF) of X-ray-selected broad-line active galactic nuclei (AGNs) at z ∼ 1.4 in the Subaru XMM-Newton Deep Survey (SXDS) field. A significant part of the accretion growth of SMBHs is thought to take place in this redshift range. Black hole masses of X-ray-selected broad-line AGNs are estimated using the width of the broad Mg II line and 3000 Å monochromatic luminosity. We supplement the Mg II FWHM values with the Hα FWHM obtained from our NIR spectroscopic survey. Using the black hole masses of broad-line AGNs at redshifts between 1.18 and 1.68, the binned broad-line AGN BHMFs and ERDFs are calculated using the V maxmethod. To properly account for selection effects that impact the binned estimates, we derive the corrected broad-line AGN BHMFs and ERDFs by applying the maximum likelihood method, assuming that the ERDF is constant regardless of the black hole mass. We do not correct for the non-negligible uncertainties in virial BH mass estimates. If we compare the corrected broad-line AGN BHMF with that in the local universe, then the corrected BHMF at z = 1.4 has a higher number density above 108 M⊙but a lower number density below that mass range. The evolution may be indicative of a downsizing trend of accretion activity among the SMBH population. The evolution of broad-line AGN ERDFs from z = 1.4 to 0 indicates that the fraction of broad-line AGNs with accretion rates close to the Eddington limit is higher at higher redshifts. © 2012. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Akiyama, Masayuki
Japan, Sendai
Tohoku University
Ueda, Yoshihiro
Japan, Kyoto
Kyoto University
Watson, Mike G.
United Kingdom, Leicester
University of Leicester
Silverman, John D.
Japan, Tokyo
The University of Tokyo
Ohta, Kouji
Japan, Kyoto
Kyoto University
Tamura, Naoyuki
Japan, Tokyo
The University of Tokyo
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Moritani, Yuuki
Japan, Kyoto
Kyoto University
Japan, Higashihiroshima
Hiroshima University
Dalton, Gavin B.
United Kingdom, Oxford
University of Oxford
United Kingdom, Didcot
Rutherford Appleton Laboratory
Bonfield, David G.
United Kingdom, Oxford
University of Oxford
Curtis-Lake, Emma F.
United Kingdom, Oxford
University of Oxford
United Kingdom, Edinburgh
The University of Edinburgh
MacAulay, Edward
United Kingdom, Oxford
University of Oxford
Sekiguchi, Kazuhiro
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Simpson, Chris J.S.M.
United Kingdom, Liverpool
Liverpool John Moores University
Croom, Scott M.
Australia, Sydney
The University of Sydney
Ouchi, Masami
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 47
Authors: 15
Affiliations: 13
Identifiers
Doi:
10.1088/0004-637X/761/2/143
ISSN:
0004637X
Study Design
Cross Sectional Study
Study Approach
Quantitative