Skip to Main content Skip to Navigation
Journal articles

Herschel observations of EXtra-Ordinary Sources (HEXOS): Detection of hydrogen fluoride in absorption towards Orion KL

Abstract : We report a detection of the fundamental rotational transition of hydrogen fluoride in absorption towards Orion KL using Herschel/HIFI. After the removal of contaminating features associated with common molecules (“weeds”), the HF spectrum shows a P-Cygni profile, with weak redshifted emission and strong blue-shifted absorption, associated with the low-velocity molecular outflow. We derive an estimate of 2.9 × 1013 cm-2 for the HF column density responsible for the broad absorption component. Using our best estimate of the H2 column density within the low-velocity molecular outflow, we obtain a lower limit of ~1.6 × 10-10 for the HF abundance relative to hydrogen nuclei, corresponding to ~0.6% of the solar abundance of fluorine. This value is close to that inferred from previous ISO observations of HF J = 2-1 absorption towards Sgr B2, but is in sharp contrast to the lower limit of 6 × 10-9 derived by Neufeld et al. for cold, foreground clouds on the line of sight towards G10.6-0.4.

Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03625646
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, March 31, 2022 - 8:42:39 AM
Last modification on : Friday, July 22, 2022 - 11:12:18 AM
Long-term archiving on: : Friday, July 1, 2022 - 7:08:42 PM

File

aa14570-10.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

T. G. Phillips, E. A. Bergin, D. C. Lis, D. A. Neufeld, T. A. Bell, et al.. Herschel observations of EXtra-Ordinary Sources (HEXOS): Detection of hydrogen fluoride in absorption towards Orion KL. Astronomy and Astrophysics - A&A, EDP Sciences, 2010, 518, ⟨10.1051/0004-6361/201014570⟩. ⟨insu-03625646⟩

Share

Metrics

Record views

24

Files downloads

2