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ALMA Observations o...
ALMA Observations of the Physical and Chemical Conditions in Centaurus A
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- McCoy, M. (author)
- New Mexico Institute of Mining and Technology
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- Ott, J. (author)
- National Radio Astronomy Observatory Socorro
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- Meier, D. S. (author)
- National Radio Astronomy Observatory Socorro,New Mexico Institute of Mining and Technology
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Espada, D. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),The Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan
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- Martin, S. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Israel, F. P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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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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- Impellizzeri, V. (author)
- National Radio Astronomy Observatory,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Edwards, P. G. (author)
- Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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- Brunthaler, Andreas (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Neumayer, N. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Peck, A. B. (author)
- National Radio Astronomy Observatory
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- van der Werf, P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Feain, I. (author)
- The University of Sydney
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(creator_code:org_t)
- 2017-12-14
- 2017
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 851:2
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Abstract
Subject headings
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- Centaurus A, with its gas-rich elliptical host galaxy, NGC 5128, is the nearest radio galaxy at a distance of 3.8 Mpc. Its proximity allows us to study the interaction among an active galactic nucleus, radio jets, and molecular gas in great detail. We present ALMA observations of low-J transitions of three CO isotopologues, HCN, HCO+, HNC, CN, and CCH toward the inner projected 500 pc of NGC 5128. Our observations resolve physical sizes down to 40 pc. By observing multiple chemical probes, we determine the physical and chemical conditions of the nuclear interstellar medium of NGC 5128. This region contains molecular arms associated with the dust lanes and a circumnuclear disk (CND) interior to the molecular arms. The CND is approximately 400 pc by 200 pc and appears to be chemically distinct from the molecular arms. It is dominated by dense gas tracers while the molecular arms are dominated by (CO)-C-12 and its rare isotopologues. The CND has a higher temperature, elevated CN/HCN and HCN/HNC intensity ratios, and much weaker (CO)-C-13 and (CO)-O-18 emission than the molecular arms. This suggests an influence from the AGN on the CND molecular gas. There is also absorption against the AGN with a low velocity complex near the systemic velocity and a high velocity complex shifted by about 60 km s(-1). We find similar chemical properties between the CND in emission and both the low and high velocity absorption complexes, implying that both likely originate from the CND. If the HV complex does originate in the CND, then that gas would correspond to gas falling toward the supermassive black hole.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: ISM
- astrochemistry
- Centaurus A)
- galaxies: elliptical and lenticular
- galaxies: individual (NGC 5128
- galaxies: structure
- galaxies: active
- cD
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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McCoy, M.
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Ott, J.
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Meier, D. S.
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Muller, Sebastie ...
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Espada, D.
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Martin, S.
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Israel, F. P.
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Henkel, C.
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Impellizzeri, V.
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Aalto, Susanne, ...
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Edwards, P. G.
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Brunthaler, Andr ...
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Neumayer, N.
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Peck, A. B.
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van der Werf, P.
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Feain, I.
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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