Water abundances in high-mass protostellar envelopes: Herschel observations with HIFI [Letter]

Marseille, M. G., van der Tak, F. F. S., Herpin, F., Wyrowski, F., Chavarria, L., Pietropaoli, B., Baudry, A., Bontemps, S., Cernicharo, J., Jacq, T., Frieswijk, W., Shipman, R., van Dishoeck, E. F., Bachiller, R., Benedettini, M., Benz, A. O., Bergin, E., Bjerkeli, P., Blake, G. A., Braine, J., Bruderer, S., Caselli, P., Caux, E., Codella, C., Daniel, F., Dieleman, P., di Giorgio, A. M., Dominik, C., Doty, S. D., Encrenaz, P., Fich, M., Fuente, A., Gaier, T., Giannini, T., Goicoechea, J. R., de Graauw, Th., Helmich, F., Herczeg, G. J., Hogerheijde, M. R., Jackson, B., Javadi, H., Jellema, W., Johnstone, D., Jorgensen, J. K., Kester, D., Kristensen, L. E., Larsson, B., Laauwen, W., Lis, D., Liseau, R., Luinge, W., McCoey, C., Megej, A., Melnick, G., Neufeld, D., Nisini, B., Olberg, M., Parise, Berengere, Pearson, J. C., Plume, R., Risacher, C., Roelfsema, P., Santiago-Garcia, J., Saraceno, P., Siegel, P., Stutzki, J., Tafalla, M., van Kempen, T. A., Visser, R., Wampfler, S. F. and Yildiz, U. A. 2010. Water abundances in high-mass protostellar envelopes: Herschel observations with HIFI [Letter]. Astronomy and Astrophysics 521 , L32. 10.1051/0004-6361/201015103

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Abstract

Aims. We derive the dense core structure and the water abundance in four massive star-forming regions in the hope of understanding the earliest stages of massive star formation. Methods. We present Herschel/HIFI observations of the para-H2O 111–000 and 202–111 and the para-H218O 111–000 transitions. The envelope contribution to the line profiles is separated from contributions by outflows and foreground clouds. The envelope contribution is modeled with Monte-Carlo radiative transfer codes for dust and molecular lines (MC3D and RATRAN), and the water abundance and the turbulent velocity width as free parameters. Results. While the outflows are mostly seen in emission in high-J lines, envelopes are seen in absorption in ground-state lines, which are almost saturated. The derived water abundances range from 5×10-10 to 4×10-8 in the outer envelopes. We detect cold clouds surrounding the protostar envelope, thanks to the very high quality of the Herschel/HIFI data and the unique ability of water to probe them. Several foreground clouds are also detected along the line of sight. Conclusions. The low H2O abundances in massive dense cores are in accordance with the expectation that high densities and low temperatures lead to freeze-out of water on dust grains. The spread in abundance values is not clearly linked to physical properties of the sources.

Item Type:	Article
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	dust, extinction ; ISM: molecules ; ISM: abundances
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher:	EDP Sciences
ISSN:	0004-6361
Date of First Compliant Deposit:	30 March 2016
Last Modified:	26 May 2023 13:09
URI:	https://orca.cardiff.ac.uk/id/eprint/52796

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