{
  "id": "1809.07337",
  "version": "v1",
  "published": "2018-09-19T18:00:02.000Z",
  "updated": "2018-09-19T18:00:02.000Z",
  "title": "SDSS J0909$+$4449: A Large-separation Strongly Lensed Quasar at $z \\sim 2.8$ with Three Images",
  "authors": [
    "Yiping Shu",
    "Rui Marques-Chaves",
    "N. Wyn Evans",
    "Ismael Pérez-Fournon"
  ],
  "comment": "5 pages, 3 figures, accepted for publication in the MNRAS Letter",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report the discovery of SDSS J0909$+$4449, an exceptional system consisting of a quasar at $z=2.788$ strongly lensed by a group of galaxies at $z \\sim 0.9$ into three images separated by up to 14\\arcsec\\, based on archival data collected by the Sloan Digital Sky Survey, extended Baryon Oscillation Spectroscopic Survey, Beijing--Arizona Sky Survey, the Mayall z-band Legacy Survey, and the Gemini Telescope. We discuss two hypotheses on the nature of SDSS J0909$+$4449, i.e. a rare triply-imaged quasar in the naked cusp configuration and a typical quadruply-imaged quasar with the fourth image undetected in the current data. We find that simple lens models can provide excellent fits to the observed image positions and the non-detection under either hypothesis. Deeper imaging data, spectroscopic observations, and follow-up light curve measurements will be helpful in determining which hypothesis is correct and provide better constraints on the lens mass distribution. Nevertheless, given its unusually large image separations, SDSS J0909$+$4449 will be a unique probe for the mass structure and the underlying cooling and stellar feedback processes on group or cluster scales.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-09-19T18:00:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "large-separation strongly lensed quasar",
      "sdss j0909",
      "extended baryon oscillation spectroscopic survey",
      "mayall z-band legacy survey",
      "sloan digital sky survey"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}