{
  "id": "astro-ph/0506462",
  "version": "v1",
  "published": "2005-06-20T16:58:15.000Z",
  "updated": "2005-06-20T16:58:15.000Z",
  "title": "Infrared luminosity functions from the Chandra Deep Field South : the Spitzer view on the history of dusty star formation at 0<z<1",
  "authors": [
    "E. Le Floc'h",
    "C. Papovich",
    "H. Dole",
    "E. Bell",
    "G. Lagache",
    "G. Rieke",
    "E. Egami",
    "P. Perez-Gonzalez",
    "A. Alonso-Herrero",
    "M. Rieke",
    "M. Blaylock",
    "C. Engelbracht",
    "K. Gordon",
    "D. Hines",
    "K. Misselt",
    "J. Morrison",
    "J. Mould"
  ],
  "comment": "Accepted for publication in ApJ. 23 pages, 15 figures",
  "journal": "Astrophys.J.632:169-190,2005",
  "doi": "10.1086/432789",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We analyze a sample of ~2600 MIPS/Spitzer 24mic sources brighter than ~80muJy and located in the Chandra Deep Field South to characterize the evolution of the comoving infrared (IR) energy density of the Universe up to z~1. Using published ancillary optical data we first obtain a nearly complete redshift determination for the 24mic objects associated with R<24 counterparts at z<1. We find that the 24mic population at 0.5<z<1 is dominated by ``Luminous Infrared Galaxies'' (i.e., 10^11 L_sol < L_IR < 10^12 L_sol), the counterparts of which appear to be also luminous at optical wavelengths and tend to be more massive than the majority of optically-selected galaxies. We finally derive 15mic and total IR luminosity functions (LFs) up to z~1. In agreement with the previous results from ISO and SCUBA and as expected from the MIPS source number counts, we find very strong evolution of the contribution of the IR-selected population with lookback time. Pure evolution in density is firmly excluded by the data, but we find considerable degeneracy between strict evolution in luminosity and a combination of increases in both density and luminosity (L*_IR prop. to (1+z)^{3.2_{-0.2}^{+0.7}}, Phi*_IR prop. to (1+z)^{0.7_{-0.6}^{+0.2}}). Our results imply that the comoving IR energy density of the Universe evolves as (1+z)^(3.9+/-0.4) up to z~1 and that galaxies luminous in the infrared (i.e., L_IR > 10^11 L_IR) are responsible for 70+/-15% of this energy density at z~1. Taking into account the contribution of the UV luminosity evolving as (1+z)^~2.5, we infer that these IR-luminous sources dominate the star-forming activity beyond z~0.7. The uncertainties affecting these conclusions are largely dominated by the errors in the k-corrections used to convert 24mic fluxes into luminosities.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2005-06-20T16:58:15.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "chandra deep field south",
      "dusty star formation",
      "infrared luminosity functions",
      "spitzer view",
      "mips/spitzer 24mic sources brighter"
    ],
    "tags": [
      "journal article",
      "famous paper"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 685449
    }
  }
}