{
  "id": "1903.01884",
  "version": "v1",
  "published": "2019-03-05T15:10:56.000Z",
  "updated": "2019-03-05T15:10:56.000Z",
  "title": "The UV and Ly$α$ Luminosity Functions of galaxies and the Star Formation Rate Density at the end of HI reionization from the VIMOS Ultra-Deep Survey (VUDS)",
  "authors": [
    "Y. Khusanova",
    "O. Le Fèvre",
    "P. Cassata",
    "O. Cucciati",
    "B. C. Lemaux",
    "L. A. M. Tasca",
    "R. Thomas",
    "B. Garilli",
    "V. Le Brun",
    "D. Maccagni",
    "L. Pentericci",
    "G. Zamorani",
    "R. Amorín",
    "S. Bardelli",
    "M. Castellano",
    "L. P. Cassarà",
    "A. Cimatti",
    "M. Giavalisco",
    "N. P. Hathi",
    "O. Ilbert",
    "A. M. Koekemoer",
    "F. Marchi",
    "J. Pforr",
    "B. Ribeiro",
    "D. Schaerer",
    "L. Tresse",
    "D. Vergani",
    "E. Zucca"
  ],
  "comment": "27 pages, submitted to A&A",
  "categories": [
    "astro-ph.GA",
    "astro-ph.CO"
  ],
  "abstract": "We establish a robust statistical description of the star-forming galaxy population at the end of cosmic HI reionization ($5.0\\le{}z\\le6.6$) from a large sample of 52 galaxies with spectroscopically confirmed redshifts from the VIMOS UltraDeep Survey. We identify galaxies with Ly$\\alpha$ either in absorption or in emission, at variance with most spectroscopic samples in the literature where Ly$\\alpha$ emitters dominate. We find that star-forming galaxies at these redshifts are distributed along a main sequence in the stellar mass vs. SFR plane. We report a flat evolution of the sSFR(z) in 3<z<6 compared to lower redshift measurements. UV-continuum slopes vary with luminosity, with a large dispersion. We determing UV and Ly$\\alpha$ luminosity functions using V$_{max}$ method and use them to derive star formation rate densities (SFRD). We find that both UV-derived and Ly$\\alpha$-derived SFRDs are in excellent agreement after correcting Ly$\\alpha$ luminosity density for IGM absorption. Our new SFRD measurements at a mean redshift z=5.6 confirm the steep decline of the SFRD at z>2. The bright end of the Ly$\\alpha$ luminosity function has a high number density, indicating a significant star formation activity concentrated in the brightest Ly$\\alpha$ emitters (LAE) at these redshifts. LAE with EW>25\\AA ~contribute to about 75\\% of the total UV-derived SFRD. While our analysis favors a low dust content in 5.0<z<6.6, uncertainties on the dust extinction correction and associated degeneracies in spectral fitting will remain an issue to estimate the total SFRD until future survey extending spectroscopy to the NIR rest-frame spectral domain, e.g. with JWST.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-03-05T15:10:56.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "star formation rate density",
      "vimos ultra-deep survey",
      "hi reionization",
      "luminosity function",
      "star formation activity"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 27,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}