BENZ, Arnold O.; BRUDERER, Simon; VAN DISHOECK, Ewine F.; TEAM, Wish; BAUDRY, Alain; BONTEMPS, Sylvain; BRAINE, J.; HERPIN, Fabrice; JACQ, T.; MARSEILLE, M.; TEAM, Hifi

doi:10.1051/0004-6361/201015111

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BENZ, Arnold O.

BRUDERER, Simon

VAN DISHOECK, Ewine F.

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Astronomy and Astrophysics - A&A. 2010, vol. 521, p. L35

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Context: Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some of them trace gas irradiated by UV or X-rays. Aims: We explore the abundances of major hydrides in W3 IRS5, a prototypical region of high-mass star formation. Methods: W3 IRS5 was observed by HIFI on the Herschel Space Observatory with deep integration (about 2500 s) in 8 spectral regions. Results: The target lines including CH, NH, H3O+, and the new molecules SH+, H2O+, and OH+ are detected. The H2O+ and OH+ J=1-0 lines are found mostly in absorption, but also appear to exhibit weak emission (P-Cyg-like). Emission requires high density, thus originates most likely near the protostar. This is corroborated by the absence of line shifts relative to the young stellar object (YSO). In addition, H2O+ and OH+ also contain strong absorption components at a velocity shifted relative to W3 IRS5, which are attributed to foreground clouds. Conclusions: The molecular column densities derived from observations correlate well with the predictions of a model that assumes the main emission region is in outflow walls, heated and irradiated by protostellar UV radiation.< Leer menos

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Hydrides in Young Stellar Objects: Radiation tracers in a protostar-disk-outflow system

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