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Probing highly obscured, self-absorbed galaxy nuclei with vibrationally excited HCN

Aalto, Susanne, 1964- (författare)
Chalmers tekniska högskola, Chalmers University of Technology
Martin, S., (författare)
Institut de RadioAstronomie Millimetrique (IRAM), Saint-Martin D'Heres, France
Costagliola, Francesco, 1981- (författare)
Chalmers tekniska högskola, Chalmers University of Technology
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Gonzalez-Alfonso, E., (författare)
University of Alcalá, Alcala De Henares/Madrid, Spain
Muller, Sebastien, 1976- (författare)
Chalmers tekniska högskola, Chalmers University of Technology
Sakamoto, K., (författare)
Academia Sinica Taiwan, Taipei, Taiwan
Fuller, G. A., (författare)
University of Manchester, Manchester, United Kingdom
Burillo, S. G., (författare)
Spanish National Observatory (OAN), Madrid, Spain
van der Werf, P., (författare)
Leiden University (UL), Leiden, Netherlands
Neri, R., (författare)
Institut de RadioAstronomie Millimetrique (IRAM), Saint-Martin D'Heres, France
Spaans, M., (författare)
University of Groningen, Groningen, Netherlands
Combes, F., (författare)
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, Paris, France
Viti, S., (författare)
University College London (UCL), London, United Kingdom
Muhle, S., (författare)
Argelander-Institut für Astronomie, Bonn, Germany
Armus, L., (författare)
California Institute of Technology (Caltech), Pasadena, USA
Evans, A., (författare)
National Radio Astronomy Observatory, Charlottesville, USA, University of Virginia, Charlottesville, United States
Sturm, E., (författare)
Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Cernicharo, J., (författare)
CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM), Madrid, Spain
Henkel, C., (författare)
King Abdulaziz University, Jeddah, Saudi Arabia, Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Greve, T. R., (författare)
University College London (UCL), London, United Kingdom
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Ingår i: Astronomy and Astrophysics. - 0004-6361. ; 584
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
  • 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.


NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)


galaxies: evolution
galaxies: nuclei
galaxies: active

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