ALMA Observations of NGC 6334S. I. Forming Massive Stars and Clusters in Subsonic and Transonic Filamentary Clouds
文献类型：期刊论文
| 作者 | Li,Shanghuo4,6,7; Zhang,Qizhou6; Liu,Hauyu Baobab8; Beuther,Henrik9; Palau,Aina10; Girart,Josep Miquel2; Smith,Howard6; Hora,Joseph L.6; Lin,Yuxing1; Qiu,Keping3 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-06-01 |
| 卷号 | 896期号:2 |
| 关键词 | Early-type stars Star formation Massive stars Protoclusters Protostars Radio spectroscopy Radio continuum emission Radio interferometers Submillimeter astronomy Molecular spectroscopy |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab84f1 |
| 英文摘要 | Abstract We present Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very Large Array (JVLA) observations of the massive infrared dark cloud NGC 6334S (also known as IRDC G350.56+0.44), located at the southwestern end of the NGC 6334 molecular cloud complex. The H13CO+ and NH2D lines covered by the ALMA observations at a ～3″ angular resolution (～0.02 pc) reveal that the spatially unresolved nonthermal motions are predominantly subsonic and transonic, a condition analogous to that found in low-mass star-forming molecular clouds. The observed supersonic nonthermal velocity dispersions in massive star-forming regions, often reported in the literature, might be significantly biased by poor spatial resolutions that broaden the observed line widths owing to unresolved motions within the telescope beam. Our 3 mm continuum image resolves 49 dense cores, whose masses range from 0.17 to 14 M⊙. The majority of them are resolved with multiple velocity components. Our analyses of these gas velocity components find an anticorrelation between the gas mass and the virial parameter. This implies that the more massive structures tend to be more gravitationally unstable. Finally, we find that the external pressure in the NGC 6334S cloud is important in confining these dense structures and may play a role in the formation of dense cores and, subsequently, the embedded young stars. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-896-2-AB84F1 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63595]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Max-Planck Institute für Radio Astronomy, Auf dem Hügel 69, D-53121, Bonn, Germany 2.Institut de Ciències de l’Espai (IEEC-CSIC), Campus UAB, Carrer de Can Magrans s/n, E-08193 Cerdanyola del Vallès, Catalonia, Spain 3.School of Astronomy and Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, People’s Republic of China 4.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China; shanghuo.li@gmail.com, jzwang@shao.ac.cn 5.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 6.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 7.University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing 100049, People’s Republic of China 8.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 106, Taiwan 9.Max Planck Institute for Astronomy, Konigstuhl 17, D-69117 Heidelberg, Germany 10.Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, P.O. Box 3-72, 58090, Morelia, Michoacán, México |
| 推荐引用方式 GB/T 7714 | Li,Shanghuo,Zhang,Qizhou,Liu,Hauyu Baobab,et al. ALMA Observations of NGC 6334S. I. Forming Massive Stars and Clusters in Subsonic and Transonic Filamentary Clouds[J]. The Astrophysical Journal,2020,896(2). |
| APA | Li,Shanghuo.,Zhang,Qizhou.,Liu,Hauyu Baobab.,Beuther,Henrik.,Palau,Aina.,...&Yue,Nannan.(2020).ALMA Observations of NGC 6334S. I. Forming Massive Stars and Clusters in Subsonic and Transonic Filamentary Clouds.The Astrophysical Journal,896(2). |
| MLA | Li,Shanghuo,et al."ALMA Observations of NGC 6334S. I. Forming Massive Stars and Clusters in Subsonic and Transonic Filamentary Clouds".The Astrophysical Journal 896.2(2020). |
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