Loenen, A. F., van der Werf, P. P., Guesten, R., Meijerink, R., Israel, F. P., Requena-Torres, M. A., Garcia-Burillo, S., Harris, A. I., Klein, T., Kramer, C., Lord, S., Martin-Pintado, J., Roellig, M., Stutzki, J., Szczerba, R. ORCID: 0000-0003-2886-4460, Weiss, A., Philipp-May, S., Yorke, H., Caux, E., Delforge, B., Helmich, F., Lorenzani, A., Morris, P., Philips, T. G., Risacher, C. and Tielens, A. G. G. M. (2010). Excitation of the molecular gas in the nuclear region of M 82. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present high-resolution HIFI spectroscopy of the nucleus of the archetypical starburst galaxy M 82. Six (CO)-C-12 lines, 2 (CO)-C-13 lines and 4 fine-structure lines have been detected. Besides showing the effects of the overall velocity structure of the nuclear region, the line profiles also indicate the presence of multiple components with different optical depths, temperatures, and densities in the observing beam. The data have been interpreted using a grid of PDR models. It is found that the majority of the molecular gas is in low density (n = 10(3.5) cm(-3)) clouds, with column densities of N-H = 10(21.5) cm(-2) and a relatively low UV radiation field (G(0) = 10(2)). The remaining gas is predominantly found in clouds with higher densities (n = 10(5) cm(-3)) and radiation fields (G(0) = 10(2.75)), but somewhat lower column densities (N-H = 10(21.2) cm(-2)). The highest J CO lines are dominated by a small (1% relative surface filling) component, with an even higher density (n = 10(6) cm(-3)) and UV field (G(0) = 10(3.25)). These results show the strength of multi-component modelling for interpretating the integrated properties of galaxies.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Loenen, A. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Werf, P. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guesten, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meijerink, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Israel, F. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Requena-Torres, M. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia-Burillo, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harris, A. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klein, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kramer, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lord, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martin-Pintado, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Roellig, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szczerba, R.UNSPECIFIEDorcid.org/0000-0003-2886-4460UNSPECIFIED
Weiss, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philipp-May, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yorke, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caux, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Delforge, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Helmich, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lorenzani, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morris, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philips, T. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Risacher, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tielens, A. G. G. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494941
DOI: 10.1051/0004-6361/201015114
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
INTERSTELLAR-MEDIUM; GALAXY NUCLEI; DENSE GAS; M82; M-82; CO; SPECTROSCOPY; DIAGNOSTICSMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49494

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