{
  "id": "2006.13937",
  "version": "v1",
  "published": "2020-06-24T18:00:00.000Z",
  "updated": "2020-06-24T18:00:00.000Z",
  "title": "The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to $z\\sim5$",
  "authors": [
    "Sarah Leslie",
    "Eva Schinnerer",
    "Daizhong Liu",
    "Benjamin Magnelli",
    "Hiddo Algera",
    "Alexander Karim",
    "Iary Davidzon",
    "Ghassem Gozaliasl",
    "Eric F. Jiménez-Andrade",
    "Philipp Lang",
    "Mark Sargent",
    "Mladen Novak",
    "Brent Groves",
    "Vernesa Smolčić",
    "Giovanni Zamorani",
    "Mattia Vaccari",
    "Andrew Battisti",
    "Eleni Vardoulaki",
    "Yingjie Peng",
    "Jeyhan Kartaltepe"
  ],
  "comment": "48 pages (main paper 25 pages, 15 figures). Accepted for publication in The Astrophysical Journal",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate (SFR) - stellar mass ($M_*$) relation, called the main sequence of star-forming galaxies (MS), for galaxies out to $z\\sim5$. We measure the MS using mean stacks of 3 GHz radio continuum images to derive average SFRs for $\\sim$200,000 mass-selected galaxies at $z>0.3$ in the COSMOS field. We describe the MS relation adopting a new model that incorporates a linear relation at low stellar mass (log($M_*$/M$_\\odot$)$<$10) and a flattening at high stellar mass that becomes more prominent at low redshift ($z<1.5$). We find that the SFR density peaks at $1.5<z<2$ and at each epoch there is a characteristic stellar mass ($M_* = 1 - 4 \\times 10^{10}\\mathrm{M}_\\odot$) that contributes the most to the overall SFR density. This characteristic mass increases with redshift, at least to $z\\sim2.5$. We find no significant evidence for variations in the MS relation for galaxies in different environments traced by the galaxy number density at $0.3<z<3$, nor for galaxies in X-ray groups at $z\\sim0.75$. We confirm that massive bulge-dominated galaxies have lower SFRs than disk-dominated galaxies at a fixed stellar mass at $z<1.2$. As a consequence, the increase in bulge-dominated galaxies in the local star-forming population leads to a flattening of the MS at high stellar masses. This indicates that \"mass-quenching\" is linked with changes in the morphological composition of galaxies at a fixed stellar mass.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-06-24T18:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "specific star formation rates",
      "ghz large project",
      "high stellar mass",
      "fixed stellar mass",
      "sfr density"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 48,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}