2010A&A...521L..38C

Query : 2010A&A...521L..38C

2010A&A...521L..38C - Astronomy and Astrophysics, volume 521, L38-38 (2010/10-1)

Herschel observations of deuterated water towards Sgr B2(M).

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., MUELLER H.S.P., MURPHY J.A., NEUFELD D.A., OSSENKOPF V., PEARSON J.C., PERAULT M., PLUME R., QIN S.-L., SCHLEMMER S., STUTZKI J., TRAPPE N., 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.

Abstract (from CDS):

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 (2.5x10–11) in the outer envelope at temperatures below 100K through a medium abundance (1.5x10–9) in the inner envelope/outer core at temperatures between 100 and 200K, and finally a high abundance (3.5x10–9) at temperatures above 200K in the hot core.

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Journal keyword(s): ISM: molecules - molecular processes - line: formation

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14404 0
2 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 736 0
3 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 673 1
4 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 407 1

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