VAN DER TAK, F. F. S.; MARSEILLE, M.; HERPIN, Fabrice; WYROWSKI, F.; BAUDRY, Alain; BONTEMPS, Sylvain; BRAINE, J.; CONSORTIUM, For The Wish

doi:10.1051/0004-6361/201014515

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VAN DER TAK, F. F. S.
Kapteyn Astronomical Institute [Groningen]

MARSEILLE, M.
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Université Sciences et Technologies - Bordeaux 1 [UB]
SRON Netherlands Institute for Space Research [SRON]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]

HERPIN, Fabrice
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
Université Sciences et Technologies - Bordeaux 1 [UB]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]

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Astronomy and Astrophysics - A&A. 2010, vol. 518, p. L107

EDP Sciences

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Water is a key molecule in the star formation process, but its spatial distribution in star-forming regions is not well known. We study the distribution of dust continuum and H2O and 13CO line emission in DR21, a luminous star-forming region with a powerful outflow and a compact HII region. Herschel-HIFI spectra near 1100 GHz show narrow 13CO 10-9 emission and H2O 1(11)-0(00) absorption from the dense core and broad emission from the outflow in both lines. The H2O line also shows absorption by a foreground cloud known from ground-based observations of low-J CO lines. The dust continuum emission is extended over 36" FWHM, while the 13CO and H2O lines are confined to ~24" or less. The foreground absorption appears to peak further North than the other components. Radiative transfer models indicate very low abundances of ~2e-10 for H2O and ~8e-7 for 13CO in the dense core, and higher H2O abundances of ~4e-9 in the foreground cloud and ~7e-7 in the outflow. The high H2O abundance in the warm outflow is probably due to the evaporation of water-rich icy grain mantles, while the H2O abundance is kept down by freeze-out in the dense core and by photodissociation in the foreground cloud.< Réduire

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Galaxy Astrophysics

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Water abundance variations around high-mass protostars: Herschel-HIFI observations of the DR21 region

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