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Herschel observations of extra-ordinary sources: Detection of Hydrogen Fluoride in absorption towards Orion~KL

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arxiv 1007.2149 v1 pith:RQYN4L34 submitted 2010-07-13 astro-ph.GA

Herschel observations of extra-ordinary sources: Detection of Hydrogen Fluoride in absorption towards Orion~KL

T.G. Phillips , E.A. Bergin , D.C. Lis , D.A. Neufeld , T.A. Bell , S.Wang , N.R. Crockett , M. Emprechtinger
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G.A. Blake E. Caux C. Ceccarelli J. Cernicharo C. Comito F. Daniel M.-L. Dubernet P. Encrenaz M. Gerin T. F. Giesen J. R. Goicoechea P. F. Goldsmith E. Herbst C. Joblin D. Johnstone W. D. Langer W.D. Latter S. D. Lord S. Maret P. G. Martin G. J. Melnick K. M. Menten P. Morris H. S. P. Muller J. A. Murphy V. Ossenkopf J. C. Pearson M. Perault R. Plume S.-L. Qin P. Schilke S. Schlemmer J. Stutzki N. Trappe F. F. S. van der Tak C. Vastel H. W. Yorke S. Yu J. Zmuidzinas A. Boogert R. Gusten P. Hartogh N. Honingh A. Karpov J. Kooi J.-M. Krieg R. Schieder
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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 x 10^13 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 x 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 x 10^-9 derived by Neufeld et al. (2010) for cold, foreground clouds on the line of sight towards G10.6-0.4.

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