Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M)

Share and Export

Schilke, P., Comito, C., Muller, 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.Anthony, Ossenkopf, V., Pagini, L., Pearson, J.C., Perault, M., Plume, R., Qin, S.-L., Salez, M., Schlemmer, S., Stutzki, J., Trappe, Neil, 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). Astronomy & Astrophysics, 521 (L11). pp. 1-7. ISSN 0004-6361

PDF
AM_Para_Oxidaniumyl.pdf
Download (267kB)

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:	Article
Additional Information:	© ESO 2010 The original publication is available at DOI: 10.1051/0004-6361/201015087
Keywords:	astrochemistry; line; profiles; molecular processes; Herschel observations;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	4025
Depositing User:	Dr. Anthony Murphy
Date Deposited:	05 Dec 2012 16:16
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
Refereed:	Yes
Related URLs:	http://www.aanda.org/ http://publications.edpsciences.org/
URI:	https://mural.maynoothuniversity.ie/id/eprint/4025
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

MURAL - Maynooth University Research Archive Library

Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M)

Abstract

Repository Staff Only (login required)

Downloads

Origin of downloads