Journal
ASTRONOMY & ASTROPHYSICS
Volume 548, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201220174
Keywords
astrochemistry; ISM: clouds; ISM: molecules; ISM: individual objects: Horsehead nebula; radio lines: ISM
Categories
Funding
- Chilean Government through the Becas Chile scholarship program
- French Agence Nationale de la Recherche [ANR-09-BLAN-0231-01]
- Deutsche Forschungsgemeinschaft [GA 370/5-1]
- Spanish MICINN [AYA2009-07304, CSD2009-00038]
- Ramon y Cajal research contract from the Spanish MICINN
- European Social Fund
Ask authors/readers for more resources
Context. CF+ has recently been detected in the Horsehead and Orion Bar photo-dissociation regions. The J = 1-0 line in the Horsehead is double-peaked in contrast to other millimeter lines. The origin of this double-peak profile may be kinematic or spectroscopic. Aims. We investigate the effect of hyperfine interactions due to the fluorine nucleus in CF+ on the rotational transitions. Methods. We compute the fluorine spin rotation constant of CF+ using high-level quantum chemical methods and determine the relative positions and intensities of each hyperfine component. This information is used to fit the theoretical hyperfine components to the observed CF+ line profiles, thereby employing the hyperfine fitting method in GILDAS. Results. The fluorine spin rotation constant of CF+ is 229.2 kHz. This way, the double-peaked CF+ line profiles are well fitted by the hyperfine components predicted by the calculations. The unusually large hyperfine splitting of the CF+ line therefore explains the shape of the lines detected in the Horsehead nebula, without invoking intricate kinematics in the UV-illuminated gas.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available