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Optical properties of infrared-bright dust-obscured galaxies viewed with Subaru Hyper Suprime-Cam

Published online by Cambridge University Press:  10 June 2020

A. Noboriguchi Open the ORCID record for A. Noboriguchi [Opens in a new window] ,
T. Nagao ,
Y. Toba ,
M. Niida ,
M. Kajisawa ,
M. Onoue ,
Y. Matsuoka ,
T. Yamashita ,
Y. Chang  and
T. Kawaguchi
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A. Noboriguchi
Affiliation:
Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan email: [email protected]
T. Nagao
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan
Y. Toba
Affiliation:
Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Kyoto606-8502, Japan
M. Niida
Affiliation:
Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan email: [email protected]
M. Kajisawa
Affiliation:
Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan email: [email protected]
M. Onoue
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Y. Matsuoka
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan
T. Yamashita
Affiliation:
Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan
Y. Chang
Affiliation:
Academia Sinica Institute of Astronomy and Astrophysics, PO Box 23-141, Taipei10617, Taiwan
T. Kawaguchi
Affiliation:
Department of Economics, Onomichi City University, Onomichi, Hiroshima722-8506, Japan
Y. Komiyama
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo181-8588, Japan
K. Nobuhara
Affiliation:
Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan email: [email protected]
Y. Terashima
Affiliation:
Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama, Ehime790-8577, Japan email: [email protected]
Y. Ueda
Affiliation:
Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Kyoto606-8502, Japan
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Abstract

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Optical properties of infrared-bright (IR-bright) dust-obscured galaxies (DOGs) are reported. DOGs are faint in optical but very bright in mid-IR, which are powered by active star formation (SF) or active galactic nucleus (AGN), or both. The DOGs is a candidate population that are evolving from a gas-rich merger to a quasar. By combining three catalogs of optical (Subaru Hyper Suprime-Cam), near-IR (VIKING), and mid-IR (ALLWISE), we have discovered 571 IR-bright DOGs. Using their spectral energy distributions, we classified the selected DOGs into the SF-dominated DOGs and the AGN-dominated DOGs. We found that the SF-dominated DOGs show a redder optical color than the AGN-dominated DOGs. Interestingly, some DOGs shows extremely blue color in optical (blue-excess DOGs: bluDOGs). A possible origin for this blue excess is either the leaked AGN light or stellar UV light from nuclear starbursts. The BluDOGs may be in the transition phase from obscured AGNs to unobscured AGNs.

Keywords

galaxies: activegalaxies: starburstinfrared: galaxiesmethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 292 - 293
Copyright
© International Astronomical Union 2020

References

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