Wess, A., Requena-Torres, M. A., Guesten, R., Garcia-Burillo, S., Harris, A. I., Israel, F. P., Klein, T., Kramer, C., Lord, S., Martin-Pintado, J., Roellig, M., Stutzki, J., Szczerba, R. ORCID: 0000-0003-2886-4460, van der Werf, P. P., Philipp-May, S., Yorke, H., Akyilmaz, M., Gal, C., Higgins, R., Marston, A., Roberts, J., Schloeder, F., Schultz, M., Teyssier, D., Whyborn, N. and Wunsch, H. J. (2010). HIFI spectroscopy of low-level water transitions in M 82. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present observations of the rotational ortho-water ground transition, the two lowest para-water transitions, and the ground transition of ionised ortho-water in the archetypal starburst galaxy M82, performed with the HIFI instrument on the Herschel Space Observatory. These observations are the first detections of the para-H2O(1(11)-0(00)) (1113 GHz) and ortho-H2O+(1(11)-0(00)) (1115 GHz) lines in an extragalactic source. All three water lines show different spectral line profiles, underlining the need for high spectral resolution in interpreting line formation processes. Using the line shape of the para-H2O(1(11)-0(00)) and ortho-H2O+(1(11)-0(00)) absorption profile in conjunction with high spatial resolution CO observations, we show that the (ionised) water absorption arises from a similar to 2000 pc(2) region within the HIFI beam located about similar to 50 pc east of the dynamical centre of the galaxy. This region does not coincide with any of the known line emission peaks that have been identified in other molecular tracers, with the exception of HCO. Our data suggest that water and ionised water within this region have high (up to 75%) area-covering factors of the underlying continuum. This indicates that water is not associated with small, dense cores within the ISM of M82 but arises from a more widespread diffuse gas component.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wess, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Requena-Torres, M. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guesten, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia-Burillo, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harris, A. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Israel, F. P.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
van der Werf, P. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Philipp-May, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yorke, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Akyilmaz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gal, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Higgins, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marston, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Roberts, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schloeder, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schultz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Teyssier, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Whyborn, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wunsch, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-495093
DOI: 10.1051/0004-6361/201015078
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
STAR-FORMATION; MOLECULAR GAS; M82; EXCITATION; GALAXIES; REGIONS; AMMONIA; DUST; DR21; H2O+Multiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49509

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