{
  "id": "1705.02567",
  "version": "v1",
  "published": "2017-05-07T05:51:30.000Z",
  "updated": "2017-05-07T05:51:30.000Z",
  "title": "Evolutionary phase of gas-rich galaxies in a galaxy cluster at z=1.46",
  "authors": [
    "Masao Hayashi",
    "Tadayuki Kodama",
    "Kotaro Kohno",
    "Yuki Yamaguchi",
    "Ken-ichi Tadaki",
    "Bunyo Hatsukade",
    "Yusei Koyama",
    "Rhythm Shimakawa",
    "Yoichi Tamura",
    "Tomoko L. Suzuki"
  ],
  "comment": "7 pages, 4 figures, 1 table, accepted for publication in the ApJ Letters",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We report a survey of molecular gas in galaxies in the XMMXCS J2215.9-1738 cluster at $z=1.46$. We have detected emission lines from 17 galaxies within a radius of $R_{200}$ from the cluster center, in Band 3 data of the Atacama Large Millimeter/submillimeter Array (ALMA) with a coverage of 93 -- 95 GHz in frequency and 2.33 arcmin$^2$ in spatial direction. The lines are all identified as CO $J$=2--1 emission lines from cluster members at $z\\sim1.46$ by their redshifts and the colors of their optical and near-infrared (NIR) counterparts. The line luminosities reach down to $L'_{\\rm CO(2-1)}=4.5\\times10^{9}$ K km s$^{-1}$ pc$^2$. The spatial distribution of galaxies with a detection of CO(2--1) suggests that they disappear from the very center of the cluster. The phase-space diagram showing relative velocity versus cluster-centric distance indicates that the gas-rich galaxies have entered the cluster more recently than the gas-poor star-forming galaxies and passive galaxies located in the virialized region of this cluster. The results imply that the galaxies have experienced ram-pressure stripping and/or strangulation during the course of infall towards the cluster center and then the molecular gas in the galaxies at the cluster center is depleted by star formation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-05-07T05:51:30.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gas-rich galaxies",
      "galaxy cluster",
      "evolutionary phase",
      "cluster center",
      "atacama large millimeter/submillimeter array"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}