{
  "id": "1803.09951",
  "version": "v2",
  "published": "2018-03-27T08:21:19.000Z",
  "updated": "2019-04-10T09:45:49.000Z",
  "title": "Optical properties of infrared-bright dust-obscured galaxies viewed with Subaru Hyper Suprime-Cam",
  "authors": [
    "Akatoki Noboriguchi",
    "Tohru Nagao",
    "Yoshiki Toba",
    "Mana Niida",
    "Masaru Kajisawa",
    "Masafusa Onoue",
    "Yoshiki Matsuoka",
    "Takuji Yamashita",
    "Yu-Yen Chang",
    "Toshihiro Kawaguchi",
    "Yutaka Komiyama",
    "Kodai Nobuhara",
    "Yuichi Terashima",
    "Yoshihiro Ueda"
  ],
  "comment": "24 pages, 24 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report on the optical properties of infrared (IR)-bright dust-obscured galaxies (DOGs) that are defined as (i-[22])_AB > 7.0. Because supermassive black holes (SMBHs) in IR-bright DOGs are expected to be rapidly growing in the major merger scenario, they provide useful clues for understanding the co-evolution of SMBHs and their host galaxies. However, the optical properties of IR-bright DOGs remain unclear because the optical emission of a DOG is very faint. By combining ~ 105 deg^2 images of the optical, near-IR, and mid-IR data obtained from the Subaru Hyper Suprime-Cam (HSC) survey, the VISTA VIKING survey, and the WISE all-sky survey, respectively, 571 IR-bright DOGs were selected. We found that IR-bright DOGs show a redder (g-z)_AB color than other populations of dusty galaxies, such as ultra-luminous IR galaxies (ULIRGs) at a similar redshift, with a significantly large dispersion. Among the selected DOGs, star-formation (SF) dominated DOGs show a relatively red color, while active galactic nucleus (AGN) dominated DOGs show a rather blue color in optical. This result is consistent with the idea that the relative AGN contribution in the optical emission becomes more significant at a later stage in the major merger scenario. We discovered eight IR-bright DOGs showing a significant blue excess in blue HSC bands (BluDOGs). This blue excess can be interpreted as a leaked AGN emission that is either a directly leaking or a scattered AGN emission, as proposed for some blue-excess Hot DOGs in earlier studies.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2019-04-10T09:45:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "subaru hyper suprime-cam",
      "optical properties",
      "infrared-bright dust-obscured galaxies",
      "major merger scenario",
      "ir-bright dogs remain unclear"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 24,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}