{
  "id": "1709.06647",
  "version": "v1",
  "published": "2017-09-19T21:20:51.000Z",
  "updated": "2017-09-19T21:20:51.000Z",
  "title": "Dust in the first galaxies",
  "authors": [
    "Jason Jaacks",
    "Steven L. Finkelstein",
    "Volker Bromm"
  ],
  "comment": "6 pages, 5 figures",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "Using cosmological volume simulations and a custom built sub-grid model for Pop III star formation, we examine the baseline dust extinction in the first galaxies due to Pop~III metal enrichment in the first billion years of cosmic history. We find that while the most enriched, high-density lines of sight in primordial galaxies can experience a measurable amount of extinction from Pop III dust ($E(B-V)_{\\rm max}=0.07,\\ A_{\\rm V,max}\\approx0.28$), the average extinction is very low with $\\left< E(B-V) \\right> \\lesssim 10^{-3}$. We derive a power-law relationship between dark matter halo mass and extinction of $E(B-V)\\propto M_{\\rm halo}^{0.80}$. Performing a Monte Carlo parameter study, we establish the baseline reddening of the UV spectra of dwarf galaxies at high redshift due to Pop III enrichment only. With this method, we find $\\left<\\beta_{\\rm UV}\\right>-2.72\\pm0.12$, which is both nearly halo mass and redshift independent.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-09-19T21:20:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first galaxies",
      "custom built sub-grid model",
      "dark matter halo mass",
      "monte carlo parameter study",
      "baseline dust extinction"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}