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  • Gonzalez-Alfonso, E.Universidad de Alcala,University of Alcalá (author)

HIGH-LYING OH ABSORPTION, [C II] DEFICITS, AND EXTREME LFIR/MH2 RATIOS IN GALAXIES

  • Article/chapterEnglish2015

Publisher, publication year, extent ...

  • 2015
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:6384015e-4d0c-46f9-a5fc-b83d7febeb23
  • https://research.chalmers.se/publication/213839URI
  • https://doi.org/10.1088/0004-637X/800/1/69DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Herschel/PACS observations of 29 local (ultra) luminous infrared galaxies, including both starburst and active galactic nucleus (AGN) dominated sources as diagnosed in the mid-infrared/optical, show that the equivalent width of the absorbing OH 65 mu m.3/2 J = 9/2-7/2 line (Weq(OH65)) with lower level energy Elow 300 K, is anticorrelated with the [Cii] 158 mu m line to far-infrared luminosity ratio, and correlated with the far-infrared luminosity per unit gas mass and with the 60-to-100 mu m far-infrared color. While all sources are in the active LIR/MH2 > 50L /M mode as derived from previous CO line studies, the OH65 absorption shows a bimodal distribution with a discontinuity at LFIR/MH2 100L /M . In the most buried sources, OH65 probes material partially responsible for the silicate 9.7 mu m absorption. Combined with observations of the OH 71 mu m.1/2 J = 7/2-5/2 doublet (Elow 415 K), radiative transfer models characterized by the equivalent dust temperature, Tdust, and the continuum optical depth at 100 mu m, t100, indicate that strong [C ii] 158 mu m deficits are associated with far-IR thick (t100 0.7, NH 1024 cm-2), warm (Tdust 60 K) structures where the OH 65 mu m absorption is produced, most likely in circumnuclear disks/tori/cocoons. With their high LFIR/MH2 ratios and columns, the presence of these structures is expected to give rise to strong [C ii] deficits. Weq(OH65) probes the fraction of infrared luminosity arising from these compact/warm environments, which is 30%-50% in sources with high Weq(OH65). Sources with high Weq(OH65) have surface densities of both LIR and MH2 higher than inferred from the half-light (CO or UV/optical) radius, tracing coherent structures that represent the most buried/active stage of (circum) nuclear starburst-AGN co-evolution.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Fischer, J.Naval Research Laboratory (author)
  • Sturm, E.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Gracia-Carpio, J.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Veilleux, S.University of Maryland (author)
  • Melendez, M.University of Maryland (author)
  • Lutz, D.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Poglitsch, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Aalto, Susanne,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)saalto (author)
  • Falstad, Niklas,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)falstad (author)
  • Spoon, H. W. W.Cornell University (author)
  • Farrah, D.Virginia Polytechnic Institute and State University (Virginia Tech) (author)
  • Blasco, A.Universidad de Alcala,University of Alcalá (author)
  • Henkel, C.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University (author)
  • Contursi, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Verma, A.University Of Oxford (author)
  • Spaans, M.Rijksuniversiteit Groningen,University of Groningen (author)
  • Smith, H. A.Harvard-Smithsonian Center for Astrophysics (author)
  • Ashby, M. L. N.Harvard-Smithsonian Center for Astrophysics (author)
  • Hailey-Dunsheath, S.California Institute of Technology (Caltech) (author)
  • Burillo, S. G.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Martin-Pintado, J.Centro de Astrobiologia (CAB) (author)
  • van der Werf, P.Universiteit Leiden (UL),Leiden University (UL) (author)
  • Meijerink, R.Universiteit Leiden (UL),Leiden University (UL) (author)
  • Genzel, R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Universidad de AlcalaNaval Research Laboratory (creator_code:org_t)

Related titles

  • In:Astrophysical Journal800:1, s. 1-101538-43570004-637X

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