[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5303/PKAS.2017.32.1.193

LUMINOSITY DEPENDENCE OF THE COVERING FACTOR OF THE DUST TORUS IN ACTIVE GALACTIC NUCLEI REVEALED BY AKARI

Toba, Yoshiki (Research Center for Space and Cosmic Evolution, Ehime University)
Oyabu, Shinki (Graduate School of Science, Nagoya University)
Matsuhara, Hideo (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
Ishihara, Daisuke (Graduate School of Science, Nagoya University)
Malkan, Matt A. (Department of Physics and Astronomy, University of California)
Wada, Takehiko (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
Ohyama, Youichi (Academia Sinica, Institute of Astronomy and Astrophysics)
Kataza, Hirokazu (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
Takita, Satoshi (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)
Yamauchi, Chisato (Misato Observatory)

Publication Information

Publications of The Korean Astronomical Society / v.32, no.1, 2017 , pp. 193-195 More about this Journal

Abstract

We demonstrate the luminosity dependence of the covering factor (CF) of active galactic nuclei (AGNs), based on AKARI mid-infrared all-sky survey catalog. Combining the AKARI with Sloan Digital Sky Survey (SDSS) spectroscopic data, we selected 243 galaxies at $9{\mu}m$ and 255 galaxies at $18{\mu}m$ . We then identified 64 AGNs at $9{\mu}m$ and 105 AGNs at $18{\mu}m$ by their optical emission lines. Following that, we estimated the CF as the fraction of type 2 AGN in all AGNs. We found that the CF decreased with increasing $18{\mu}m$ luminosity, regardless of the choice of type 2 AGN classification criteria.

Keywords

galaxies: active; infrared: galaxies;

Citations & Related Records

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