{
  "id": "1412.2016",
  "version": "v1",
  "published": "2014-12-05T14:54:44.000Z",
  "updated": "2014-12-05T14:54:44.000Z",
  "title": "Polar-ring galaxies: the SDSS view on the symbiotic galaxies",
  "authors": [
    "V. Reshetnikov",
    "F. Combes"
  ],
  "comment": "8 pages, 11 figures, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "Polar-ring galaxies are multi-spin systems, showing star formation in a blue late-type component, perpendicular to a red early-type one, revealing how galaxy formation can sometimes occur in successive steps. We perform two-dimensional decomposition in the $g$, $r$, $i$ bandpasses of 50 polar-ring galaxies (PRGs) from the Sloan Digital Sky Survey. Each object was fit with a S\\'ersic host galaxy and a S\\'ersic ring. Our general results are: (i) The central (host) galaxies of the PRGs are non-dwarf sub-$L^{\\ast}$ galaxies with colors typical for early-type galaxies. (ii) Polar structures in our sample are, on average, fainter and bluer than their host galaxies. (iii) In most galaxies, the stellar mass M$_*$ of the polar component is not negligible in comparison with that of the host. (iv) The distributions of the host galaxies on the size -- luminosity and Kormendy diagrams are shifted by $\\sim 1^m$ to fainter magnitudes in comparison with E/S0 galaxies. It means that the PRGs hosts are more similar to quenched disks than to ordinary early-type galaxies. (v) All the PRGs in our sample are detected in mid-infrared by WISE, and we derive from the 22$\\mu$m luminosity their star formation rate (SFR). Their SFR/M$_*$ ratio is larger than for the early-type galaxy sample of Atlas$^{\\rm 3D}$, showing that the star forming disk brings a significant contribution to the new stars. Globally, PRGs appear frequently on the green valley in the mass-color diagram, revealing the symbiotic character between a red-sequence host and a blue cloud ring.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-12-05T14:54:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "polar-ring galaxies",
      "symbiotic galaxies",
      "sdss view",
      "early-type galaxy",
      "sloan digital sky survey"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2604",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Mar",
      "volume": 447,
      "number": 3,
      "pages": 2287
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1332907,
      "adsabs": "2015MNRAS.447.2287R"
    }
  }
}