Comito, C. and Lis, D. C. and Phillips, T. G. and Bell, T. A. and Blake, G. A. and Emprechtinger, M. and Latter, W. D. and Lord, S. D. and Morris, P. (2010) Herschel observations of deuterated water towards Sgr B2(M). Astronomy and Astrophysics, 521 . Art. No. L38. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20101222-105232360
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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.
|Additional Information:||© 2010 ESO. Received 31 May 2010, Accepted 26 July 2010, Published online 01 October 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. This paper is dedicated to the memory of Oliver Siebertz (1967-2010). HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France and the US. Consortium members are: Canada: CSA, U. Waterloo; France: CESR, LAB, LERMA, IRAM; Germany: KOSMA, MPIfR, MPS; Ireland, NUI Maynooth; Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri- INAF; Netherlands: SRON, TUD; Poland: CAMK, CBK; Spain: Observatorio Astronï£¡mico Nacional (IGN), Centro de Astrobiologìa (CSICINTA). Sweden: Chalmers University of Technology – MC2, RSS & GARD; Onsala Space Observatory; Swedish National Space Board, Stockholm University – Stockholm Observatory; Switzerland: ETH Zurich, FHNW; USA: Caltech, JPL, NHSC. Support for this work was provided by NASA through an award issued by JPL/Caltech. CSO is supported by the NSF, award AST- 0540882.|
|Subject Keywords:||ISM: molecules – molecular processes – line: formation|
|Official Citation:||Herschel observations of deuterated water towards Sgr B2(M) C. Comito, P. Schilke, R. Rolffs, D. C. Lis, A. Belloche, E. A. Bergin, T. G. Phillips, T. A. Bell, N. R. Crockett, S. Wang, G. A. Blake, E. Caux, C. Ceccarelli, J. Cernicharo, F. Daniel, M.-L. Dubernet, M. Emprechtinger, P. Encrenaz, M. Gerin, T. F. Giesen, J. R. Goicoechea, P. F. Goldsmith, H. Gupta, E. Herbst, C. Joblin, D. Johnstone, W. D. Langer, W. D. Latter, S. D. Lord, S. Maret, P. G. Martin, G. J. Melnick, K. M. Menten, P. Morris, H. S. P. Müller, J. A. Murphy, D. A. Neufeld, V. Ossenkopf, J. C. Pearson, M. Pérault, R. Plume, S.-L. Qin, S. Schlemmer, J. Stutzki, N. Trappe, F. F. S. van der Tak, C. Vastel, H. W. Yorke, S. Yu, M. Olberg, R. Szczerba, B. Larsson, R. Liseau, R. H. Lin, L. A. Samoska and E. Schlecht A&A 521 L38 (2010) DOI: 10.1051/0004-6361/201015121|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||23 Dec 2010 15:57|
|Last Modified:||26 Dec 2012 12:47|
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