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HIGH-LYING OH ABSOR...
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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
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2015
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electronicrdacarrier
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LIBRIS-ID:oai:research.chalmers.se:6384015e-4d0c-46f9-a5fc-b83d7febeb23
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https://research.chalmers.se/publication/213839URI
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https://doi.org/10.1088/0004-637X/800/1/69DOI
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
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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.
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Fischer, J.Naval Research Laboratory
(author)
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Sturm, E.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Gracia-Carpio, J.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Veilleux, S.University of Maryland
(author)
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Melendez, M.University of Maryland
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Lutz, D.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Poglitsch, A.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Aalto, Susanne,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)saalto
(author)
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Falstad, Niklas,1987Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)falstad
(author)
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Spoon, H. W. W.Cornell University
(author)
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Farrah, D.Virginia Polytechnic Institute and State University (Virginia Tech)
(author)
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Blasco, A.Universidad de Alcala,University of Alcalá
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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)
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Contursi, A.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.University Of Oxford
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Spaans, M.Rijksuniversiteit Groningen,University of Groningen
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Smith, H. A.Harvard-Smithsonian Center for Astrophysics
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Ashby, M. L. N.Harvard-Smithsonian Center for Astrophysics
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Hailey-Dunsheath, S.California Institute of Technology (Caltech)
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Burillo, S. G.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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Martin-Pintado, J.Centro de Astrobiologia (CAB)
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van der Werf, P.Universiteit Leiden (UL),Leiden University (UL)
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Meijerink, R.Universiteit Leiden (UL),Leiden University (UL)
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Genzel, R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Universidad de AlcalaNaval Research Laboratory
(creator_code:org_t)
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In:Astrophysical Journal800:1, s. 1-101538-43570004-637X
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Sturm, E.
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Gracia-Carpio, J ...
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Melendez, M.
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Lutz, D.
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Poglitsch, A.
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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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