LUMINOSITY AND REDSHIFT DEPENDENCE OF THE COVERING FACTOR OF ACTIVE GALACTIC NUCLEI VIEWED WITH WISE AND SLOAN DIGITAL SKY SURVEY

被引:66
作者
Toba, Y. [1 ,2 ,3 ]
Oyabu, S. [4 ]
Matsuhara, H. [1 ,2 ]
Malkan, M. A. [5 ]
Gandhi, P. [6 ]
Nakagawa, T. [2 ]
Isobe, N. [2 ]
Shirahata, M. [2 ,7 ]
Oi, N. [2 ]
Ohyama, Y. [8 ]
Takita, S. [2 ]
Yamauchi, C. [9 ]
Yano, K. [2 ,10 ]
机构
[1] Grad Univ Adv Studies Sokendai, Dept Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan
[2] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan
[3] Ehime Univ, Res Ctr Space & Cosm Evolut, Matsuyama, Ehime 7908577, Japan
[4] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan
[5] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[6] Univ Durham, Dept Phys, Durham DH1 3LE, England
[7] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
[8] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
[9] Misato Observ, Misato, Wakayama 6401366, Japan
[10] Univ Tokyo, Sch Sci, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
关键词
catalogs; galaxies : active; galaxies : luminosity function; mass function; galaxies : nuclei; infrared : galaxies; methods : statistical; SPECTROSCOPIC TARGET SELECTION; XMM-NEWTON; MIDINFRARED SELECTION; HOST GALAXIES; DATA RELEASE; AGN; EMISSION; CLASSIFICATION; QUASARS; DUST;
D O I
10.1088/0004-637X/788/1/45
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this work, we investigate the dependence of the covering factor (CF) of active galactic nuclei (AGNs) on the mid-infrared (MIR) luminosity and the redshift. We constructed 12 and 22 mu m luminosity functions (LFs) at 0.006 <= z <= 0.3 using Wide-field Infrared Survey Explorer (WISE) data. Combining the WISE catalog with Sloan Digital Sky Survey (SDSS) spectroscopic data, we selected 223,982 galaxies at 12 mu m and 25,721 galaxies at 22 mu m for spectroscopic classification. We then identified 16,355 AGNs at 12 mu m and 4683 AGNs at 22 mu m by their optical emission lines and cataloged classifications in the SDSS. Following that, we estimated the CF as the fraction of Type 2 AGN in all AGNs whose MIR emissions are dominated by the active nucleus (not their host galaxies) based on their MIR colors. We found that the CF decreased with increasing MIR luminosity, regardless of the choice of Type 2 AGN classification criteria, and the CF did not change significantly with redshift for z <= 0.2. Furthermore, we carried out various tests to determine the influence of selection bias and confirmed that similar dependences exist, even when taking these uncertainties into account. The luminosity dependence of the CF can be explained by the receding torus model, but the "modified" receding torus model gives a slightly better fit, as suggested by Simpson.
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页数:36
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