The chemistry of ions in the Orion Bar I. – CH+, SH+, and CF+ - The effect of high electron density and vibrationally excited H2 in a warm PDR surface

Z. Nagy; F. F. S. Van der Tak; V. Ossenkopf; M. Gerin; F. Le Petit; J. Le Bourlot; J. H. Black; J. R. Goicoechea; C. Joblin; M. Röllig; E. A. Bergin

doi:10.1051/0004-6361/201220519

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Volume 550 (February 2013)

A&A, 550 (2013) A96

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Fig. 9

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CH⁺ line intensities as a function of E_u, comparison between the observed line intensities and the predictions of an isobaric PDR model with a pressure of 10⁸ cm^-3 K for a radiation field of χ = 10⁴.

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