{
  "id": "2001.02720",
  "version": "v1",
  "published": "2020-01-08T20:04:29.000Z",
  "updated": "2020-01-08T20:04:29.000Z",
  "title": "Signatures of first galaxies at FIR/sub-mm wavelengths",
  "authors": [
    "Maria Emilia De Rossi",
    "Volker Bromm"
  ],
  "comment": "3 pages, 2 figures. Accepted for publication in BAAA, Vol. 61B, 2020",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We explore the possibility of detecting first galaxies with a generic far-infrared/sub-millimeter telescope by applying an analytical model of primordial dust emission. As shown in previous works, galaxies at redshifts $z>7$ experience a strong negative K-correction in such a way that systems of similar masses are brighter at higher $z$. In addition, at a given mass and $z$, our model predicts that luminosity fluxes increase proportionally to the dust-to-metal ratios ($D/M$) of primeval sources. We evaluate the observability of model sources at different $z>7$ as a function of the observed survey area ($\\Delta \\Omega$) and sensitivity ($S$) of a generic instrument. Assuming $\\Delta \\Omega \\sim 10~{\\rm deg}^2$ and a plausible $S \\sim 1~{\\mu}{\\rm Jy}$ for a near future survey, we could assure the detection of at least one typical source with $D/M \\sim 5\\times10^{-3}$ at $z>7$. For $S\\gtrsim 1~{\\mu}{\\rm Jy}$ and $\\Delta \\Omega \\lesssim 10~{\\rm deg}^2$, higher than typical $D/M$ are required to detect at least one individual source at $z>7$. The observability of model galaxies is also affected by the size distribution of dust grains, specially towards higher $z$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-08T20:04:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first galaxies",
      "fir/sub-mm wavelengths",
      "signatures",
      "generic far-infrared/sub-millimeter telescope",
      "luminosity fluxes increase"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 3,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}