{
  "id": "2110.13167",
  "version": "v2",
  "published": "2021-10-25T18:00:03.000Z",
  "updated": "2021-12-21T18:28:26.000Z",
  "title": "The CGM$^2$ Survey: Circumgalactic O VI from dwarf to massive star-forming galaxies",
  "authors": [
    "K. Tchernyshyov",
    "J. K. Werk",
    "M. C. Wilde",
    "J. X. Prochaska",
    "T. M. Tripp",
    "J. N. Burchett",
    "R. Bordoloi",
    "J. C. Howk",
    "N. Lehner",
    "J. M. O'Meara",
    "N. Tejos",
    "J. Tumlinson"
  ],
  "comment": "25 pages, 9 figures. Accepted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We combine 126 new galaxy-O VI absorber pairs from the CGM$^2$ survey with 123 pairs drawn from the literature to examine the simultaneous dependence of the column density of O VI absorbers ($N_{\\rm O VI}$) on galaxy stellar mass, star formation rate, and impact parameter. The combined sample consists of 249 galaxy-O VI absorber pairs covering $z=0$-$0.6$, with host galaxy stellar masses $M^*=10^{7.8}$-$10^{11.2}$ $M_\\odot$ and galaxy-absorber impact parameters $R_\\perp=0$-$400$ proper kiloparsecs. In this work, we focus on the variation of $N_{\\rm O VI}$ with galaxy mass and impact parameter among the star-forming galaxies in the sample. We find that the average $N_{\\rm O VI}$ within one virial radius of a star-forming galaxy is greatest for star-forming galaxies with $M^*=10^{9.2}$-$10^{10}$ $M_\\odot$. Star-forming galaxies with $M^*$ between $10^{8}$ and $10^{11.2}$ $M_\\odot$ can explain most O VI systems with column densities greater than 10$^{13.5}$ cm$^{-2}$. 60% of the O VI mass associated with a star-forming galaxy is found within one virial radius and 35% is found between one and two virial radii. In general, we find that some departure from hydrostatic equilibrium in the CGM is necessary to reproduce the observed O VI amount, galaxy mass dependence, and extent. Our measurements serve as a test set for CGM models over a broad range of host galaxy masses.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2021-12-21T18:28:26.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "star-forming galaxy",
      "massive star-forming galaxies",
      "galaxy-o vi absorber pairs",
      "virial radius",
      "galaxy mass"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 25,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}