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20 April 2024

» arxiv » 1007.1420

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Strong CH+ J=1-0 emission and absorption in DR21
E. Falgarone ; V. Ossenkopf ; M. Gerin ; P. Lesaffre ; B. Godard ; J. Pearson ; S. Cabrit ; Ch. Joblin ; A. O.~Benz ; F. Boulanger ; A. Fuente ; R. Güsten ; A. Harris ; T. Klein ; C. Kramer ; S. Lord ; P. Martin ; J. Martin-Pintado ; D. Neufeld ; T. G.~Phillips ; M. Röllig ; R. Simon ; J. Stutzki ; F. van der Tak ; D. Teyssier ; H. Yorke ; N. Erickson ; M. Fich ; W. Jellema ; A. Marston ; C. Risacher ; M. Salez ; F. Schmülling ;
Date:	8 Jul 2010
Abstract:	We report the first detection of the ground-state rotational transition of the methylidyne cation CH+ towards the massive star-forming region DR21 with the HIFI instrument onboard the Herschel satellite. The line profile exhibits a broad emission line, in addition to two deep and broad absorption features associated with the DR21 molecular ridge and foreground gas. These observations allow us to determine a CH+ J=1-0 line frequency of 835137 +/- 3 MHz, in good agreement with a recent experimental determination. We estimate the CH+ column density to be a few 1e13 cm^-2 in the gas seen in emission, and > 1e14 cm^-2 in the components responsible for the absorption, which is indicative of a high line of sight average abundance [CH+]/[H] > 1.2x10^-8. We show that the CH+ column densities agree well with the predictions of state-of-the-art C-shock models in dense UV-illuminated gas for the emission line, and with those of turbulent dissipation models in diffuse gas for the absorption lines.
Source:	arXiv, 1007.1420
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