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HIGH-LYING OH ABSOR...
HIGH-LYING OH ABSORPTION, [C II] DEFICITS, AND EXTREME LFIR/MH2 RATIOS IN GALAXIES
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- Gonzalez-Alfonso, E. (author)
- Universidad de Alcala,University of Alcalá
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- Fischer, J. (author)
- Naval Research Laboratory
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- Sturm, E. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Gracia-Carpio, J. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Veilleux, S. (author)
- University of Maryland
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- Melendez, M. (author)
- University of Maryland
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- Lutz, D. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Poglitsch, A. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Falstad, Niklas, 1987 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Spoon, H. W. W. (author)
- Cornell University
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- Farrah, D. (author)
- Virginia Polytechnic Institute and State University (Virginia Tech)
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- Blasco, A. (author)
- Universidad de Alcala,University of Alcalá
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- Henkel, C. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University
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- Contursi, A. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Verma, A. (author)
- University Of Oxford
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- Spaans, M. (author)
- Rijksuniversiteit Groningen,University of Groningen
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- Smith, H. A. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Ashby, M. L. N. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Hailey-Dunsheath, S. (author)
- California Institute of Technology (Caltech)
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- Burillo, S. G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Martin-Pintado, J. (author)
- Centro de Astrobiologia (CAB)
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Meijerink, R. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Genzel, R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Astrophysical Journal. - 1538-4357 .- 0004-637X. ; 800:1, s. 1-10
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- 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
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies evolution
- star-formation
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Gonzalez-Alfonso ...
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Fischer, J.
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Sturm, E.
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Gracia-Carpio, J ...
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Veilleux, S.
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Melendez, M.
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show more...
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Lutz, D.
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Poglitsch, A.
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Aalto, Susanne, ...
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Falstad, Niklas, ...
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Spoon, H. W. W.
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Farrah, D.
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Blasco, A.
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Henkel, C.
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Contursi, A.
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Verma, A.
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Spaans, M.
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Smith, H. A.
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Ashby, M. L. N.
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Hailey-Dunsheath ...
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Burillo, S. G.
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Martin-Pintado, ...
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van der Werf, P.
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Meijerink, R.
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Genzel, R.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Chalmers University of Technology