Universität zu Köln

Schilke, P., Comito, C., Mueller, H. S. P., Bergin, E. A., Herbst, E., Lis, D. C., Neufeld, D. A., Phillips, T. G., Bell, T. A., Blake, G. A., Cabrit, S., Caux, E., Ceccarelli, C., Cernicharo, J., Crockett, N. R., Daniel, F., Dubernet, M. -L., Emprechtinger, M., Encrenaz, P., Falgarone, E., Gerin, M., Giesen, T. F., Goicoechea, J. R., Goldsmith, P. F., Gupta, H., Joblin, C., Johnstone, D., Langer, W. D., Latter, W. B., Lord, S. D., Maret, S., Martin, P. G., Melnick, G. J., Menten, K. M., Morris, P., Murphy, J. A., Ossenkopf, V., Pagani, L., Pearson, J. C., Perault, M., Plume, R., Qin, S. -L., Salez, M., Schlemmer, S., Stutzki, J., Trappe, N., van der Tak, F. F. S., Vastel, C., Wang, S., Yorke, H. W., Yu, S., Erickson, N., Maiwald, F. W., Kooi, J., Karpov, A., Zmuidzinas, J., Boogert, A., Schieder, R. and Zaal, P. (2010). Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M). Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds between the Sun and Sgr B2. The average o/p ratio of H2O+ in most velocity intervals is 4.8, which corresponds to a nuclear spin temperature of 21 K. The relationship of this spin temperature to the formation temperature and current physical temperature of the gas hosting H2O+ is discussed, but no firm conclusion is reached. In the velocity interval 0-60 km s(-1), an ortho/para ratio of below unity is found, but if this is due to an artifact of contamination by other species or real is not clear.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schilke, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Comito, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, H. S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bergin, E. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Herbst, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lis, D. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Neufeld, D. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Phillips, T. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bell, T. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Blake, G. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cabrit, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caux, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ceccarelli, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cernicharo, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Crockett, N. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Daniel, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dubernet, M. -L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Emprechtinger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Encrenaz, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Falgarone, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerin, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giesen, T. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goicoechea, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goldsmith, P. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gupta, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Joblin, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Johnstone, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Langer, W. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Latter, W. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lord, S. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maret, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Martin, P. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Melnick, G. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Morris, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Murphy, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ossenkopf, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pagani, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pearson, J. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Perault, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Plume, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Qin, S. -L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Salez, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stutzki, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Trappe, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Tak, F. F. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vastel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yorke, H. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yu, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Erickson, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maiwald, F. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kooi, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karpov, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zmuidzinas, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boogert, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schieder, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zaal, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-495046
DOI:	10.1051/0004-6361/201015087
Journal or Publication Title:	Astron. Astrophys.
Volume:	521
Date:	2010
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	0004-6361
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LASER MAGNETIC-RESONANCE; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; SUBMILLIMETER; LINE; BAND; SPECTRUM; B2; HYDROGEN; SPACE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49504