{
  "id": "2004.09873",
  "version": "v1",
  "published": "2020-04-21T10:07:24.000Z",
  "updated": "2020-04-21T10:07:24.000Z",
  "title": "Sub-galactic scaling relations between X-ray luminosity, star-formation rate, and stellar mass",
  "authors": [
    "Konstantinos Kouroumpatzakis",
    "Andreas Zezas",
    "Paul Sell",
    "Konstantinos Kovlakas",
    "Paolo Bonfini",
    "Steven Willner",
    "Matthew Ashby",
    "Alexandros Maragkoudakis",
    "Thomas Jarrett"
  ],
  "comment": "19 pages, 13 figures, accepted for publication in MNRAS (2020-04-19)",
  "doi": "10.1093/mnras/staa1063",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "X-ray luminosity ($L_X$) originating from high-mass X-ray binaries (HMXBs) is tightly correlated with the host galaxy's star-formation rate (SFR). We explore this connection at sub-galactic scales spanning ${\\sim}$7 dex in SFR and ${\\sim}$8 dex in specific SFR (sSFR). There is good agreement with established relations down to ${\\rm SFR {\\simeq} 10^{-3}\\,M_\\odot \\, yr^{-1}}$, below which an excess of X-ray luminosity emerges. This excess likely arises from low mass X-ray binaries. The intrinsic scatter of the $L_X$-SFR relation is constant, not correlated with SFR. Different star formation indicators scale with $L_X$ in different ways, and we attribute the differences to the effect of star formation history. The SFR derived from H$\\alpha$ shows the tightest correlation with X-ray luminosity because H$\\alpha$ emission probes stellar populations with ages similar to HMXB formation timescales, but the H$\\alpha$-based SFR is reliable only for $\\rm sSFR{>}10^{-12}\\,M_\\odot \\, yr^{-1}/M_\\odot$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-04-21T10:07:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray luminosity",
      "sub-galactic scaling relations",
      "stellar mass",
      "low mass x-ray binaries",
      "emission probes stellar populations"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}