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

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

2010-07-20

arxiv.org/abs/1007.3370v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Astronomy and Astrophysics Letters, in press

Scientific paper

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.

Affiliated with

Also associated with

No associations

Rating

Hydrides in Young Stellar Objects: Radiation tracers in a protostar-disk-outflow system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hydrides in Young Stellar Objects: Radiation tracers in a protostar-disk-outflow system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrides in Young Stellar Objects: Radiation tracers in a protostar-disk-outflow system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-125612