{
  "id": "1703.09724",
  "version": "v1",
  "published": "2017-03-28T18:00:22.000Z",
  "updated": "2017-03-28T18:00:22.000Z",
  "title": "The VLA-COSMOS 3 GHz Large Project: The cosmic star formation history since z~5",
  "authors": [
    "M. Novak",
    "V. Smolcic",
    "J. Delhaize",
    "I. Delvecchio",
    "G. Zamorani",
    "N. Baran",
    "M. Bondi",
    "P. Capak",
    "C. L. Carilli",
    "P. Ciliegi",
    "F. Civano",
    "O. Ilbert",
    "A. Karim",
    "C. Laigle",
    "O. Le Fevre",
    "S. Marchesi",
    "H. McCracken",
    "O. Miettinen",
    "M. Salvato",
    "M. Sargent",
    "E. Schinnerer",
    "L. Tasca"
  ],
  "comment": "18 pages, 8 figures",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We make use of the deep Karl G. Jansky Very Large Array (VLA) COSMOS radio observations at 3 GHz to infer radio luminosity functions of star-forming galaxies up to redshifts of z~5 based on approximately 6000 detections with reliable optical counterparts. This is currently the largest radio-selected sample available out to z~5 across an area of 2 square degrees with a sensitivity of rms=2.3 ujy/beam. By fixing the faint and bright end shape of the radio luminosity function to the local values, we find a strong redshift trend that can be fitted with a pure luminosity evolution L~(1+z)^{(3.16 +- 0.2)-(0.32 +- 0.07) z}. We estimate star formation rates (SFRs) from our radio luminosities using an infrared (IR)-radio correlation that is redshift dependent. By integrating the parametric fits of the evolved luminosity function we calculate the cosmic SFR density (SFRD) history since z~5. Our data suggest that the SFRD history peaks between 2<z<3 and that the ultraluminous infrared galaxies (ULIRGs; 100 Msol/yr<SFR<1000 Msol/yr) contribute up to ~25% to the total SFRD in the same redshift range. Hyperluminous infrared galaxies (HyLIRGs; SFR>1000 Msol/yr) contribute an additional <2% in the entire observed redshift range. We find evidence of a potential underestimation of SFRD based on ultraviolet (UV) rest-frame observations of Lyman break galaxies (LBGs) at high redshifts (z>4) on the order of 15-20%, owing to appreciable star formation in highly dust-obscured galaxies, which might remain undetected in such UV observations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-03-28T18:00:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmic star formation history",
      "ghz large project",
      "infer radio luminosity functions",
      "estimate star formation rates",
      "vla-cosmos"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}