{
  "id": "1606.01268",
  "version": "v1",
  "published": "2016-06-03T20:30:47.000Z",
  "updated": "2016-06-03T20:30:47.000Z",
  "title": "Obscured AGNs in Bulgeless Hosts discovered by WISE: The Case Study of SDSS J1224+5555",
  "authors": [
    "S. Satyapal",
    "N. J. Secrest",
    "B. Rothberg",
    "J. O'Connor",
    "S. L. Ellison",
    "R. C. Hickox",
    "A. Constantin",
    "M. Gliozzi",
    "J. L. Rosenberg"
  ],
  "comment": "Accepted to ApJ, 14 pages, 7 figures",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "There is mounting evidence that supermassive black holes form and grow in bulgeless galaxies. However, a robust determination of the fraction of AGNs in bulgeless galaxies, an important constraint to models of supermassive black hole seed formation and merger-free models of AGN fueling, is unknown, since optical studies have been shown to be incomplete for low mass AGNs. In a recent study using the Wide-field Infrared Survey Explorer, we discovered hundreds of bulgeless galaxies that display mid-infrared signatures of extremely hot dust suggestive of powerful accreting massive black holes, despite having no signatures of black hole activity at optical wavelengths. Here we report X-ray follow-up observations of J122434.66+555522.3, a nearby (z=0.052) isolated bulgeless galaxy that contains an unresolved X-ray source detected at the 3 sigma level by XMM-Newton with an observed luminosity uncorrected for intrinsic absorption of L{2-10~keV}=1.1+/-0.4 10^40 ergs/s. Ground-based near-infrared spectroscopy with the Large Binocular Telescope together with multiwavelength observations from ultraviolet to millimeter wavelengths together suggest that J1224+5555 harbors a highly absorbed AGN with an intrinsic absorption of ~NH >10^24 cm^-2. The hard X-ray luminosity of the putative AGN corrected for absorption is L{2-10~keV}~3x10^42 ergs/s, which, depending on the bolometric correction factor, corresponds to a bolometric luminosity of the AGN of 6x10^43ergs/s - 3x10^44 erg/s, and a lower mass limit for the black hole of MBH~2x10^6 Msun, based on the Eddington limit.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-06-03T20:30:47.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "case study",
      "bulgeless hosts",
      "obscured agns",
      "black hole seed formation",
      "bulgeless galaxy"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}