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

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Phillips, T.G., Bergin, E.A., Lis, D.C., Neufeld, D.A., Bell, T.A., Wang, S., Crockett, N.R., Emprechtinger, M., Blake, G.A., Caux, E., Ceccarelli, C., Cernicharo, J., Comito, C., Daniel, F., Dubernet, M.-L., Encrenaz, P., Gerin, M., Giesen, T.F., Goicoechea, J.R., Goldsmith, P.F., Herbst, E., Joblin, C., Johnstone, D., Langer, W.D., Latter, W.D., Lord, S.D., Maret, S., Martin, P.G., Melnick, G.J., Menten, K.M., Morris, P., Muller, H.S.P., Murphy, J.Anthony, Ossenkopf, V., Pearson, J.C., Perault, M., Plume, R., Qin, S.-L., Schilke, P., Schlemmer, S., Stutzki, J., Trappe, Neil, van der Tak, F.F.S., Vastel, C., Yorke, H.W., Yu, S., Zmuidzinas, J., Boogert, A., Gusten, R., Hartogh, P., Honingh, N., Kooi, J., Karpov, A., Krieg, J.-M. and Schieder, R. (2010) Herschel observations of EXtra-Ordinary Sources (HEXOS): Detection of hydrogen fluoride in absorption towards Orion KL. Astronomy & Astrophysics, 518 (L109). pp. 1-5. ISSN 0004-6361

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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.

Item Type:	Article
Keywords:	ISM; abundances; molecules; submillimeter;
Academic Unit:	Faculty of Science and Engineering > Experimental Physics
Item ID:	2080
Depositing User:	Dr. Neil Trappe
Date Deposited:	11 Aug 2010 15:25
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
Refereed:	Yes
Related URLs:	http://www.aanda.org/
URI:	https://mural.maynoothuniversity.ie/id/eprint/2080
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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

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