Herschel observations of deuterated water towards Sgr B2(M)

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Comito, C., Schilke, P., Rolffs, R., Lis, D.C., Belloche, A., Bergin, E.A., Phillips , T.G., Bell, T.A., Crockett, N.R., Wang, S., Blake, G.A., Caux, E., Ceccarelli, C., Cernicharo, J., Daniel, F., Dubernet, M.-L., Emprechtinger, M., Encrenaz, P., Gerin, M., Giesen, T.F., Goicoechea, J.R., Goldsmith, P.F., Gupta, H., Herbst, E., Joblin, C., Johnstone, D., Langer, W.D., Latter, W.D., Lord, S.D., Maret, S., Martin, P.G., Melnick, G.J., Menten, K.M., Morris, P., Muller, H.S.P., Murphy, J.Anthony, Neufeld, D.A., Ossenkopf, V., Pearson, J.C., Perault, M., Plume, R., Qin, S.-L., Schlemmer, S., Stutzki, J., Trappe, Neil, van der Tak, F.F.S., Vastel, C., Yorke, H.W., Yu, S., Olberg, M., Szczerba, R., Larsson, B., Liseau, R., Lin, R.H., Samoska, L.A. and Schlecht, E. (2010) Herschel observations of deuterated water towards Sgr B2(M). Astronomy & Astrophysics, 521 (L38). pp. 1-5. ISSN 0004-6361

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Abstract

Observations of HDO are an important complement for studies of water, because they give strong constraints on the formation processes – grain surfaces versus energetic process in the gas phase, e.g. in shocks. The HIFI observations of multiple transitions of HDO in Sgr B2(M) presented here allow the determination of the HDO abundance throughout the envelope, which has not been possible before with ground-based observations only. The abundance structure has been modeled with the spherical Monte Carlo radiative transfer code RATRAN, which also takes radiative pumping by continuum emission from dust into account. The modeling reveals that the abundance of HDO rises steeply with temperature from a low abundance (2.5 × 10−11) in the outer envelope at temperatures below 100 K through a medium abundance (1.5 × 10−9) in the inner envelope/outer core at temperatures between 100 and 200 K, and finally a high abundance ( 3.5 × 10−9) at temperatures above 200 K in the hot core.

Item Type:	Article
Additional Information:	© ESO 2010 The original publication is available at DOI: 10.1051/0004-6361/201015121
Keywords:	ISM; molecules; molecular processes; line; formation; Herschel;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	4030
Depositing User:	Dr. Anthony Murphy
Date Deposited:	11 Dec 2012 16:25
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/4030
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

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Herschel observations of deuterated water towards Sgr B2(M)

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