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Probing highly obsc...
Probing highly obscured, self-absorbed galaxy nuclei with vibrationally excited HCN
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Martin, S. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Costagliola, Francesco, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gonzalez-Alfonso, E. (author)
- Universidad de Alcala,University of Alcalá
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Sakamoto, K. (author)
- Academia Sinica Taiwan
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- Fuller, G. A. (author)
- University of Manchester
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- Burillo, S. G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Neri, R. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Spaans, M. (author)
- Rijksuniversiteit Groningen,University of Groningen
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- Combes, F. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Viti, S. (author)
- University College London (UCL)
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Muhle, S. (author)
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- Armus, L. (author)
- California Institute of Technology (Caltech)
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- Evans, A. (author)
- National Radio Astronomy Observatory,University of Virginia
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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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- Cernicharo, J. (author)
- CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
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- Henkel, C. (author)
- King Abdulaziz University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Greve, T. R. (author)
- University College London (UCL)
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(creator_code:org_t)
- 2015-11-18
- 2015
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 584
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Abstract
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- We present high resolution (0.'' 4) IRAM PdBI and ALMA mm and submm observations of the (ultra) luminous infrared galaxies ((U)LIRGs) IRAS 17208-0014, Arp220, IC 860 and Zw049.057 that reveal intense line emission from vibrationally excited (nu(2) = 1) J = 3-2 and 4-3 HCN. The emission is emerging from buried, compact (r 5 x 10(13) L-circle dot kpc(-2). These nuclei are likely powered by accreting supermassive black holes (SMBHs) and/or hot (>200 K) extreme starbursts. Vibrational, nu(2) = 1, lines of HCN are excited by intense 14 mu m mid-infrared emission and are excellent probes of the dynamics, masses, and physical conditions of (U)LIRG nuclei when H-2 column densities exceed 10(24) cm(-2). It is clear that these lines open up a new interesting avenue to gain access to the most obscured AGNs and starbursts. Vibrationally excited HCN acts as a proxy for the absorbed mid-infrared emission from the embedded nuclei, which allows for reconstruction of the intrinsic, hotter dust SED. In contrast, we show strong evidence that the ground vibrational state (. = 0), J = 3-2 and 4-3 rotational lines of HCN and HCO+ fail to probe the highly enshrouded, compact nuclear regions owing to strong self-and continuum absorption. The HCN and HCO+ line profiles are double-peaked because of the absorption and show evidence of non-circular motions-possibly in the form of in-or outflows. Detections of vibrationally excited HCN in external galaxies are so far limited to ULIRGs and early-type spiral LIRGs, and we discuss possible causes for this. We tentatively suggest that the peak of vibrationally excited HCN emission is connected to a rapid stage of nuclear growth, before the phase of strong feedback.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: evolution
- galaxies: nuclei
- galaxies: active
- galaxies
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Aalto, Susanne, ...
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Martin, S.
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Costagliola, Fra ...
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Gonzalez-Alfonso ...
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Muller, Sebastie ...
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Sakamoto, K.
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show more...
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Fuller, G. A.
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Burillo, S. G.
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van der Werf, P.
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Neri, R.
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Spaans, M.
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Combes, F.
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Viti, S.
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Muhle, S.
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Armus, L.
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Evans, A.
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Sturm, E.
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Cernicharo, J.
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Henkel, C.
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Greve, T. R.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Astronomy and As ...
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Chalmers University of Technology