Browse > Article
http://dx.doi.org/10.5303/PKAS.2012.27.4.335

THE 18 ㎛ LUMINOSITY FUNCTION OF GALAXIES WITH AKARI  

Toba, Yoshiki (Department of Space and Astronautical Science, the Graduate University for Advanced Studies (Sokendai))
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 (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)
Publication Information
Publications of The Korean Astronomical Society / v.27, no.4, 2012 , pp. 335-338 More about this Journal
Abstract
We present the $18{\mu}m$ luminosity function (LF) of galaxies at 0.006 < z < 0.8 (the average redshift is ~ 0.04) using the AKARI mid-infrared All-Sky Survey catalogue. We have selected 243 galaxies at $18{\mu}m$ from the Sloan Digital Sky Survey (SDSS) spectroscopic region. These galaxies then have been classified into five types; Seyfert 1 galaxies (Sy1, including quasars), Seyfert 2 galaxies (Sy2), low ionization narrow emission line galaxies (LINER), galaxies that are likely to contain both star formation and Active Galactic Nuclei (AGN) activities (composites), and star forming galaxies (SF) using optical emission lines such as the line width of $H{\alpha}$ or the emission line ratios of [OIII]/$H{\beta}$ and [NII]/$H{\alpha}$. As a result of constructing the LF of Sy1 and Sy2, we found the following results; (i) the number density ratio of Sy2 to Sy1 is $1.64{\pm}0.37$, larger than the results obtained from optical LF and (ii) the fraction of Sy2 in the entire AGN population may decrease with $18{\mu}m$ luminosity. These results suggest that most of the AGNs in the local universe are obscured by dust and the torus structure probably depends on the mid-infrared luminosity.
Keywords
infrared: galaxy, luminosity function; conferences: proceedings;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Abazajian, K. N., et al., 2009, The Seventh Data Release of the Sloan Digital Sky Survey, ApJS, 182, 543   DOI
2 Baldwin, J. A., Phillips, M. M., & Terlevich, R., 1981, Classification Parameters for the Emission-Line Spectra of Extragalactic Objects, PASP, 93, 5   DOI
3 Burlon, D., et al., 2011, Three-year Swift-BAT Survey of Active Galactic Nuclei: Reconciling Theory and Observations?, AJ, 728, 58   DOI
4 Dye, S., et al., 2010, Herschel-ATLAS: Evolution of the 250 ${\mu}m$ Luminosity Function out to z = 0.5, A&A, 518, L10   DOI   ScienceOn
5 Fang, F., Shupe, D. L., Xu, C., & Hacking, P. B., 1998, The Mid-Infrared Color-Luminosity Relation and the Local 12 Micron Luminosity Function, AJ, 500, 693   DOI
6 Hao, L., et al., 2005, Active Galactic Nuclei in the Sloan Digital Sky Survey. II. Emission-Line Luminosity Function, AJ, 129, 1795   DOI   ScienceOn
7 Hao, L., et al., 2005, Active Galactic Nuclei in the Sloan Digital Sky Survey. I. Sample Selection, AJ, 129, 1783   DOI   ScienceOn
8 Huchra, J. P., Geller, M. J., & Corwin, H. G., Jr., 1995, The CfA Redshift Survey: Data for the NGP +36 Zone, ApJS, 99, 391   DOI
9 Ishihara, D., et al., 2010, The AKARI/IRC Mid- Infrared All-Sky Survey, A&A, 514, 1
10 Kataza, H., et al., 2010, AKARI/IRC Point Source Catalogue Version 1.0 -Release Note (Rev.1)
11 Lutz, D., Maiolino, R., Spoon, H. W. W., & Moorwood, A. F. M., 2004, The Relation between AGN Hard X-Ray Emission and Mid-Infrared Continuum from ISO Spectra: Scatter and Unification Aspects, A&A, 418, 465   DOI   ScienceOn
12 Lawrence, A., 1991, The Relative Frequency of Broad- Lined and Narrow-Lined Active Galactic Nuclei - Implications for Unified Schemes, MNRAS, 252, 586   DOI
13 Malizia, A., et al., 2009, The Fraction of Compton- Thick Sources in an INTEGRAL Complete AGN Sample, MNRAS, 399, 944   DOI   ScienceOn
14 Pozzi, F., et al., 2004, The Mid-Infrared Luminosity Function of Galaxies in the European Large Area Infrared Space Observatory Survey Southern Fields, AJ, 609, 122   DOI
15 Rodighiero, G., et al., 2010, Mid- and Far-Infrared Luminosity Functions and Galaxy Evolution from Multiwavelength Spitzer Observations up to z 2.5, A&A, 515, 8   DOI   ScienceOn
16 Rush, B., Malkan, M. A., & Spinoglio, L., 1993, The Extended 12 Micron Galaxy Sample, ApJS, 89, 1   DOI
17 Yamamura, I., et al., 2010, AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010), yCat, 2298, 0
18 Saunders, W., et al., 1990, The 60-Micron and Far- Infrared Luminosity Functions of IRAS Galaxies, MNRAS, 242, 318   DOI
19 Schmidt, M., 1968, Space Distribution and Luminosity Functions of Quasi-Stellar Radio Sources, AJ, 151, 393   DOI
20 Shang, Z., et al., 2011, The Next Generation Atlas of Quasar Spectral Energy Distributions from Radio to X-Rays, ApJS 196, 2   DOI