تقرير
Strong CH+ J=1-0 emission and absorption in DR21
| العنوان: | Strong CH+ J=1-0 emission and absorption in DR21 |
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| المؤلفون: | Falgarone, E., Ossenkopf, V., Gerin, M., Lesaffre, P., Godard, B., Pearson, J., Cabrit, S., Joblin, Ch., Benz, A. O., Boulanger, F., Fuente, A., Güsten, R., Harris, A., Klein, T., Kramer, C., Lord, S., Martin, P., Martin-Pintado, J., Neufeld, D., Phillips, T. G., Röllig, M., Simon, R., Stutzki, J., van der Tak, F., Teyssier, D., Yorke, H., Erickson, N., Fich, M., Jellema, W., Marston, A., Risacher, C., Salez, M., Schmülling, F. |
| سنة النشر: | 2010 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
| الوصف: | 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. Comment: Accepted for publication in A&A |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/201014671 |
| URL الوصول: | http://arxiv.org/abs/1007.1420 |
| رقم الأكسشن: | edsarx.1007.1420 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/201014671 |
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