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| Título: | Strong CH+ J = 1-0 emission and absorption in DR21 |
Autor: | Falgarone, E.; Martín-Pintado, Jesús CSIC ORCID; Schmülling, F. | Fecha de publicación: | 2010 | Editor: | Springer Nature | Citación: | Astronomy and Astrophysics 518: L118 (2010) | Resumen: | We report the first detection of the ground-state rotational transition of the methylidyne cation CH+ towards the massive star-forming region DR 21 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 DR 21 molecular ridge and foreground gas. These observations allow us to determine a 12CH+J = 1-0 line frequency of ν = 835 137 ± 3 MHz, in good agreement with a recent experimental determination. We estimate the CH+ column density to be a few 1013 cm-2 in the gas seen in emission, and >1014 cm-2 in the components responsible for the absorption, which is indicative of a high line of sight average abundance [CH+] /[H] > 1.2 × 10-8. 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. © 2010 ESO | Descripción: | Falgarone, E. et al. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361/201014671 | URI: | http://hdl.handle.net/10261/86880 | DOI: | 10.1051/0004-6361/201014671 | Identificadores: | doi: 10.1051/0004-6361/201014671 issn: 0004-6361 e-issn: 1432-0746 |
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