{
  "id": "1604.03945",
  "version": "v1",
  "published": "2016-04-13T20:00:04.000Z",
  "updated": "2016-04-13T20:00:04.000Z",
  "title": "The Kinematics of CIV in Star-Forming Galaxies at z~1.2",
  "authors": [
    "Xinnan Du",
    "Alice E. Shapley",
    "Crystal L. Martin",
    "Alison L. Coil"
  ],
  "comment": "21 pages, 14 figures, submitted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present the first statistical sample of rest-frame far-UV spectra of star-forming galaxies at z~1. These spectra are unique in that they cover the high-ionization CIV{\\lambda}{\\lambda}1548, 1550 doublet. We also detect low-ionization features such as SiII{\\lambda}1527, FeII{\\lambda}1608, AlII{\\lambda}1670, NiII{\\lambda}{\\lambda}1741, 1751 and SiII{\\lambda}1808, and intermediate-ionization features from AlIII{\\lambda}{\\lambda}1854, 1862. Comparing the properties of absorption lines of lower- and higher- ionization states provides a window into the multi-phase nature of circumgalactic gas. Our sample is drawn from the DEEP2 survey and spans the redshift range 1.01 < z < 1.35 (<z> = 1.25). By isolating the interstellar CIV absorption from the stellar P-Cygni wind profile we find that 69% of the CIV profiles are blueshifted with respect to the systemic velocity. Furthermore, CIV shows a small but significant blueshift relative to FeII (offset of the best-fit linear regression -76 $\\pm$ 26 km/s). At the same time, the CIV blueshift is on average comparable to that of MgII{\\lambda}{\\lambda}2796, 2803. At this point, in explaining the larger blueshift of CIV absorption at the ~ 3-sigma level, we cannot distinguish between the faster motion of highly-ionized gas relative to gas traced by FeII, and filling in on the red side from resonant CIV emission. We investigate how far-UV interstellar absorption kinematics correlate with other galaxy properties using stacked spectra. These stacking results show a direct link between CIV absorption and the current SFR, though we only observe small velocity differences among different ionization states tracing the outflowing ISM.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-04-13T20:00:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "star-forming galaxies",
      "far-uv interstellar absorption kinematics correlate",
      "ionization states",
      "detect low-ionization features",
      "resonant civ emission"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016arXiv160403945D"
    }
  }
}