NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-25 T20:06:52 PDT
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For refcode 2013PASJ...65..113T:
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Copyright by Astronomical Society of Japan. 2013PASJ...65..113T The 9 and 18 Micrometer Luminosity Functions of Various Types of Galaxies with AKARI: Implication for the Dust Torus Structure of AGN Toba, Yoshiki; Oyabu, Shinki; Matsuhara, Hideo; Malkan, Matthew A.; Ishihara, Daisuke; Wada, Takehiko; Ohyama, Youichi; Takita, Satoshi; Yamauchi, Chisato Abstract. We present the 9 and 18 micron luminosity functions (LFs) of galaxies at 0.006 <= z <= 0.8 (with an average redshift of ~ 0.04) using the AKARI mid-infrared all-sky survey catalog. We selected 243 galaxies at 9 micron and 255 galaxies at 18 micron from the Sloan Digital Sky Survey (SDSS) spectroscopy region. These galaxies were then classified by their optical emission lines, such as the line width of Halpha or by their emission line ratios of [O III]/Hbeta and [N II]/Halpha into five types: Type 1 active galactic nuclei (AGN) (Type 1); Type 2 AGN (Type 2); low-ionization narrow emission line galaxies (LINER); galaxies with both star formation and narrow-line AGN activity (composite galaxies); and star-forming galaxies (SF). We found that (i) the number density ratio of Type 2 to Type 1 AGNs is 1.73 +/- 0.36, which is larger than a result obtained from the optical LF and (II) this ratio decreases with increasing 18 mu m luminosity. Key words: galaxies: active, galaxies: luminosity function, mass function, galaxies: nuclei, infrared: galaxies
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