{
  "id": "2105.05260",
  "version": "v2",
  "published": "2021-05-11T18:00:02.000Z",
  "updated": "2021-10-08T07:07:55.000Z",
  "title": "MUSEQuBES: Characterizing the circumgalactic medium of redshift $\\approx3.3$ Ly$α$ emitters",
  "authors": [
    "Sowgat Muzahid",
    "Joop Schaye",
    "Sebastiano Cantalupo",
    "Raffaella Anna Marino",
    "Nicolas F. Bouche",
    "Sean Johnson",
    "Michael Maseda",
    "Martin Wendt",
    "Lutz Wisotzki",
    "Johannes Zabl"
  ],
  "comment": "MNRAS accepted on 06 October, 2021",
  "doi": "10.1093/mnras/stab2933",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present the first characterization of the circumgalactic medium of Ly$\\alpha$ emitters (LAEs), using a sample of 96 $z\\approx3.3$ LAEs detected with the VLT/MUSE in fields centered on 8 bright background quasars. The LAEs have low Ly$\\alpha$ luminosities ($\\sim 10^{42}\\,\\text{erg}\\,\\text{s}^{-1}$) and star formation rates (SFRs) $\\sim 1~\\text{M}_\\odot\\,\\text{yr}^{-1}$, which for main sequence galaxies corresponds to stellar masses of only $\\sim 10^{8.6}\\,\\text{M}_\\odot$. The median transverse distance between the LAEs and the quasar sightlines is 165 proper kpc (pkpc). We stacked the high-resolution quasar spectra and measured significant excess HI and CIV absorption near the LAEs out to 500 $\\text{km}\\,\\text{s}^{-1}$ and at least $\\approx 250$ pkpc (corresponding to $\\approx 7$ virial radii). At $\\lesssim 30~\\text{km}\\,\\text{s}^{-1}$ from the galaxies the median HI and CIV optical depths are enhanced by an order of magnitude. The absorption is significantly stronger around the $\\approx 1/3$ of our LAEs that are part of `groups', which we attribute to the large-scale structures in which they are embedded. We do not detect any strong dependence of either the HI or CIV absorption on transverse distance (over the range $\\approx 50-250$ pkpc), redshift, or the properties of the Ly$\\alpha$ emission line (luminosity, full width at half maximum, or equivalent width). However, for HI, but not CIV, the absorption at $\\lesssim 100\\,\\text{km}\\,\\text{s}^{-1}$ from the LAE does increase with the SFR. This suggests that LAEs surrounded by more HI tend to have higher SFRs.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2021-10-08T07:07:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "circumgalactic medium",
      "main sequence galaxies corresponds",
      "civ absorption",
      "bright background quasars",
      "median transverse distance"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}