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|Title:||Molecular envelope around the HII region RCW 120|
|Authors:||Kirsanova, M. S.|
Pavlyuchenkov, Ya. N.
Wiebe, D. S.
Boley, P. A.
Salii, S. V.
Kalenskii, S. V.
Sobolev, A. M.
Anderson, L. D.
|Publisher:||Oxford University Press|
|Citation:||Molecular envelope around the HII region RCW 120 / M. S. Kirsanova, Ya. N. Pavlyuchenkov, D. S. Wiebe, et al. — DOI 10.1093/mnras/stz2048 // Monthly Notices of the Royal Astronomical Society. — 2019. — Vol. 488. — Iss. 4. — P. 5641-5650.|
|Abstract:||The H II region RCW 120 is a well-known object, which is often considered as a target to verify theoretical models of gas and dust dynamics in the interstellar medium. However, the exact geometry of RCW 120 is still a matter of debate. In this work, we analyse observational data on molecular emission in RCW 120 and show that 13CO(2-1) and C18O(2-1) lines are fitted by a 2D model representing a ring-like face-on structure. The changing of the C18O(3-2) line profile from double-peaked to single-peaked from the dense molecular Condensation 1 might be a signature of stalled expansion in this direction. In order to explain a self-absorption dip of the 13CO(2-1) and 13CO(3-2) lines, we suggest that RCW 120 is surrounded by a diffuse molecular cloud, and find confirmation of this cloud on a map of interstellar extinction. Optically thick 13CO(2-1) emission and the infrared 8 μm PAH band form a neutral envelope of the H II region resembling a ring, while the envelope breaks into separate clumps on images made with optically thin C18O(2-1) line and far-infrared dust emission. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society|
H II REGIONS
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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