ALMA Observations of NGC 6334S. I. Forming Massive Stars and Clusters in Subsonic and Transonic Filamentary Clouds
Li,Shanghuo1,2,3; Zhang,Qizhou2; Liu,Hauyu Baobab4; Beuther,Henrik5; Palau,Aina6; Girart,Josep Miquel7; Smith,Howard2; Hora,Joseph L.2; Lin,Yuxing8; Qiu,Keping9; Strom,Shaye2; Wang,Junzhi1; Li,Fei1,3; Yue,Nannan3,10
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
KeywordEarly-type stars Star formation Massive stars Protoclusters Protostars Radio spectroscopy Radio continuum emission Radio interferometers Submillimeter astronomy Molecular spectroscopy
WOS IDIOP:0004-637X-896-2-ab84f1
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China;,
2.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
3.University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing 100049, People’s Republic of China
4.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 106, Taiwan
5.Max Planck Institute for Astronomy, Konigstuhl 17, D-69117 Heidelberg, Germany
6.Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, P.O. Box 3-72, 58090, Morelia, Michoacán, México
7.Institut de Ciències de l’Espai (IEEC-CSIC), Campus UAB, Carrer de Can Magrans s/n, E-08193 Cerdanyola del Vallès, Catalonia, Spain
8.Max-Planck Institute für Radio Astronomy, Auf dem Hügel 69, D-53121, Bonn, Germany
9.School of Astronomy and Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, People’s Republic of China
10.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
Recommended Citation
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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