Influence of Wolf–Rayet Stars on Surrounding Star-forming Molecular Clouds
Baug,T.1; Grijs,Richard de2,3,4; Dewangan,L. K.5; Herczeg,Gregory J.1; Ojha,D. K.6; Wang,Ke1; Deng,Licai7; Bhatt,B. C.8
Source PublicationThe Astrophysical Journal
AbstractAbstract We investigate the influence of Wolf–Rayet (W-R) stars on their surrounding star-forming molecular clouds. We study five regions containing W-R stars in the inner Galactic plane (l?~?[14°–52°]), using multiwavelength data from near-infrared to radio wavelengths. Analysis of 13CO line data reveals that these W-R stars have developed gas-deficient cavities in addition to molecular shells with expansion velocities of a few kilometers per second. The pressure owing to stellar winds primarily drives these expanding shells and sweeps up the surrounding matter to distances of a few parsecs. The column densities of shells are enhanced by a minimum of 14% for one region to a maximum of 88% for another region with respect to the column densities within their central cavities. No active star formation—including molecular condensations, protostars, or ionized gas—is found inside the cavities, whereas such features are observed around the molecular shells. Although the expansion of ionized gas is considered an effective mechanism to trigger star formation, the dynamical ages of the H ii?regions in our sample are generally not sufficiently long to do so efficiently. Overall, our results hint at the possible importance of negative W-R wind-driven feedback on the gas-deficient cavities, where star formation is quenched as a consequence. In addition, the presence of active star formation around the molecular shells indicates that W-R stars may also assist in accumulating molecular gas, and that they could initiate star formation around those shells.
KeywordHII regions ISM: clouds ISM: kinematics and dynamics stars: formation stars: pre-main sequence stars: Wolf–Rayet
WOS IDIOP:0004-637X-885-1-ab46be
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Kavli Institute for Astronomy and Astrophysics, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, People’s Republic of China,
2.Department of Physics and Astronomy, Macquarie University, Balaclava Road, Sydney, NSW 2109, Australia
3.Research Centre for Astronomy, Astrophysics and Astrophotonics, Macquarie University, Balaclava Road, Sydney, NSW 2109, Australia
4.International Space Science Institute–Beijing, 1 Nanertiao, Zhongguancun, Hai Dian District, Beijing 100190, People’s Republic of China
5.Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
6.Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
7.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China
8.Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India
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GB/T 7714
Baug,T.,Grijs,Richard de,Dewangan,L. K.,等. Influence of Wolf–Rayet Stars on Surrounding Star-forming Molecular Clouds[J]. The Astrophysical Journal,2019,885(1).
APA Baug,T..,Grijs,Richard de.,Dewangan,L. K..,Herczeg,Gregory J..,Ojha,D. K..,...&Bhatt,B. C..(2019).Influence of Wolf–Rayet Stars on Surrounding Star-forming Molecular Clouds.The Astrophysical Journal,885(1).
MLA Baug,T.,et al."Influence of Wolf–Rayet Stars on Surrounding Star-forming Molecular Clouds".The Astrophysical Journal 885.1(2019).
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