Molecular envelope around the HII region RCW 120(Article)(Open Access)
- aInstitute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskaya Str., Moscow, 119017, Russian Federation
- bMoscow Institute of Physics and Technology, 9 Institutskiy per., Dolgoprudny, Moscow Region, 141701, Russian Federation
- cInstitute of Natural Sciences and Mathematics, Ural Federal University, 19 Mira Str., Ekaterinburg, 620075, Russian Federation
- dAstro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, 84/32 Profsoyuznaya Str., Moscow, 117997, Russian Federation
- eDepartment of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, United States
- fCenter for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV 26505, United States
- gGreen Bank Observatory, P.O. Box 2, Green Bank, WV 24944, United States
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
Indexed keywords
| Engineering controlled terms: | Stars |
|---|---|
| Engineering uncontrolled terms | A-RINGSDust dynamicsExtinctionH II regionsInterstellar mediasISM: kinematicModeling of gas dynamicsStars formationStars: massiveTheoretical modeling |
| Engineering main heading: | Dust |
Funding details
| Funding sponsor | Funding number | Acronym |
|---|---|---|
| Russian Foundation for Basic Research | 18-32-20049 | РФФИ |
| Ministério da Educação e Ciência | AAAA-A17-117030310283-7 | MEC |
| Ministry of Education and Science of the Russian Federation | Minobrnauka | |
| Max-Planck-Gesellschaft | MPG | |
| Universidad de Chile | C-0885,C-9501,E-078,E-181,F-9040,M-079,M-081 | |
| Government Council on Grants, Russian Federation |
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1
MSK and YaNP were partly funded by the Russian Foundation for Basic Research, research project 18-32-20049.
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2
We are thankful to D. A. Kovaleva, V. V. Akimkin for fruitful discussions of RCW 120 and also to staff of Onsala Space Observatory for their care for technical details of the O-083.F-9311A-2009 project. MSK and YaNP were partly funded by the Russian Foundation for Basic Research, research project 18-32-20049. SVS and AMS work was supported in part by the Ministry of Education and Science (the basic part of the State assignment, no. AAAA-A17-117030310283-7) and by the Act no. 211 of the Government of the Russian Federation, agreement no. 02.A03.21.0006. This research is based on observations with the Atacama Pathfinder EXperiment (APEX) telescope. APEX is a collaboration between the Max Planck Institute for Radio Astronomy, the European Southern Observatory, and the Onsala Space Observatory. The ATLASGAL project is a collaboration between the Max-Planck-Gesellschaft, the European Southern Observatory (ESO), and the Universidad de Chile. It includes projects E-181.C-0885, E-078.F-9040(A), M-079.C-9501(A), M-081.C-9501(A) plus Chilean data. This research has made use of NASA's Astrophysics Data System Bibliographic Services; SIMBAD data base, operated at CDS, Strasbourg, France (Wenger et al. 2000); Aladin web page (Bonnarel et al. 2000); Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration 2013); APLpy, an open-source plotting package for Python ((http://aplpy.github.com) Robitaille & Bressert 2012).
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3
SVS and AMS work was supported in part by the Ministry of Education and Science (the basic part of the State assignment, no. AAAA-A17-117030310283-7) and by the Act no. 211 of the Government of the Russian Federation, agreement no. 02.A03.21.0006.
- ISSN: 00358711
- CODEN: MNRAA
- Source Type: Journal
- Original language: English
- DOI: 10.1093/mnras/stz2048
- Document Type: Article
- Publisher: Oxford University Press
Kirsanova, M.S.; Institute of Astronomy, Russian Academy of Sciences, 48 Pyatnitskaya Str., Moscow, Russian Federation;
© Copyright 2022 Elsevier B.V., All rights reserved.
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