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ALMA observations o...
ALMA observations of CS in NGC 1068: chemistry and excitation
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- Scourfield, M. (author)
- University College London (UCL)
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- Viti, S. (author)
- University College London (UCL)
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- Garcia-Burillo, S. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Saintonge, A. (author)
- University College London (UCL)
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- Combes, F. (author)
- Centre national de la recherche scientifique (CNRS)
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- Fuente, A. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Henkel, C. (author)
- King Abdulaziz University,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy
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Alonso-Herrero, A. (author)
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- Harada, N. (author)
- Academia Sinica Taiwan
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- Takano, S. (author)
- Nihon University
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- Nakajima, T. (author)
- Nagoya University
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- Martin, S. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA),European Southern Observatory Santiago
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- Krips, M. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- van der Werf, P. P. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Usero, A. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Kohno, K. (author)
- University of Tokyo, Japan
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(creator_code:org_t)
- 2020-07-02
- 2020
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 496:4, s. 5308-5329
- Related links:
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present results from Atacama Large Millimeter/submillimeter Array (ALMA) observations of CS from the nearby galaxy NGC 1068 (similar to 14 Mpc). This Seyfert 2 barred galaxy possesses a circumnuclear disc (CND, r similar to 200 pc) and a starburst ring (SB ring, r similar to 1.3 kpc). These high-resolution maps (similar to 0.5 arcsec, similar to 35 pc) allow us to analyse specific sub-regions in the galaxy and investigate differences in line intensity ratios and physical conditions, particularly those between the CND and SB ring. Local thermodynamic equilibrium (LTE) analysis of the gas is used to calculate CS densities in each sub-region, followed by the non-LTE analysis conducted using the radiative transfer code RADEX to fit observations and constrain gas temperature, CS column density and hydrogen density. Finally, the chemical code UCLCHEM is used to reconstruct the gas, allowing an insight into its origin and chemical history. The density of hydrogen in the CND is found to be >= 10(5) cm(-2), although exact values vary, reaching 10(6) cm(-2) at the active galactic nucleus. The conditions in the two arms of the SB ring appear similar to one another, though the density found (similar to 10(4) cm(-2)) is lower than in the CND. The temperature in the CND increases from east to west, and is also overall greater than found in the SB ring. These modelling methods indicate the requirement for multiphase gas components in order to fit the observed emission over the galaxy. A larger number of high-resolution transitions across the SLED may allow for further constraining of the conditions, particularly in the SB ring.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- galaxies: individual: NGC 1068
- galaxies: ISM
- galaxies: nuclei
- radio lines: galaxies
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Scourfield, M.
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Viti, S.
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Garcia-Burillo, ...
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Saintonge, A.
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Combes, F.
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Fuente, A.
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show more...
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Henkel, C.
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Alonso-Herrero, ...
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Harada, N.
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Takano, S.
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Nakajima, T.
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Martin, S.
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Krips, M.
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van der Werf, P. ...
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Aalto, Susanne, ...
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Usero, A.
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Kohno, K.
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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 ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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Monthly Notices ...
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Chalmers University of Technology