Expanding shell and star formation in the infrared dust bubble N6

Yuan, Jing-Hua; Li, Jin Zeng; Liu, Hongli; Wu, Yuefang

doi:10.1088/0004-637X/797/1/40

Title: Expanding shell and star formation in the infrared dust bubble N6

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Abstract

We have carried out a multiwavelength study of the infrared dust bubble N6 to extensively investigate the molecular environs and star-forming activities therein. Mapping observations in {sup 12}CO J = 1-0 and {sup 13}CO J = 1-0 performed with the Purple Mountain Observatory 13.7 m telescope have revealed four velocity components. Comparison between distributions of each component and the infrared emission suggests that three components are correlated with N6. There are 10 molecular clumps detected. Among them, five have reliable detections in both {sup 12}CO and {sup 13}CO and have similar LTE and non-LTE masses ranging from 200 to higher than 5000 M {sub ☉}. With larger gas masses than virial masses, these five clumps are gravitationally unstable and have the potential to collapse to form new stars. The other five clumps are only reliably detected in {sup 12}CO and have relatively small masses. Five clumps are located on the border of the ring structure, and four of them are elongated along the shell. This is well in agreement with the collect-and-collapse scenario. The detected velocity gradient reveals that the ring structure is still under expansion owing to stellar winds from the exciting star(s). Furthermore, 99 young stellar objects (YSOs)more »« less

Authors:

Yuan, Jing-Hua; Li, Jin Zeng; Liu, Hongli ^[1]; Wu, Yuefang ^[2]

National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012 (China)
Department of Astronomy, Peking University, 100871 Beijing (China)

Publication Date:: Wed Dec 10 00:00:00 EST 2014

OSTI Identifier:: 22370044

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 797; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON 12; CARBON 13; CARBON MONOXIDE; COMPARATIVE EVALUATIONS; DETECTION; DISTRIBUTION; DUSTS; EMISSION; EXPANSION; INFRARED SPECTRA; MAPPING; MASS; STARS; STELLAR WINDS; TELESCOPES; VELOCITY

Citation Formats


                    Yuan, Jing-Hua, Li, Jin Zeng, Liu, Hongli, and Wu, Yuefang. Expanding shell and star formation in the infrared dust bubble N6.  United States: N. p., 2014. 
        Web.  doi:10.1088/0004-637X/797/1/40.

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                    Yuan, Jing-Hua, Li, Jin Zeng, Liu, Hongli, & Wu, Yuefang. Expanding shell and star formation in the infrared dust bubble N6.  United States.  https://doi.org/10.1088/0004-637X/797/1/40

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                    Yuan, Jing-Hua, Li, Jin Zeng, Liu, Hongli, and Wu, Yuefang. 2014.  
        "Expanding shell and star formation in the infrared dust bubble N6".  United States.  https://doi.org/10.1088/0004-637X/797/1/40.

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@article{osti_22370044,

  title        = {Expanding shell and star formation in the infrared dust bubble N6},

  author       = {Yuan, Jing-Hua and Li, Jin Zeng and Liu, Hongli and Wu, Yuefang},

  abstractNote = {We have carried out a multiwavelength study of the infrared dust bubble N6 to extensively investigate the molecular environs and star-forming activities therein. Mapping observations in {sup 12}CO J = 1-0 and {sup 13}CO J = 1-0 performed with the Purple Mountain Observatory 13.7 m telescope have revealed four velocity components. Comparison between distributions of each component and the infrared emission suggests that three components are correlated with N6. There are 10 molecular clumps detected. Among them, five have reliable detections in both {sup 12}CO and {sup 13}CO and have similar LTE and non-LTE masses ranging from 200 to higher than 5000 M {sub ☉}. With larger gas masses than virial masses, these five clumps are gravitationally unstable and have the potential to collapse to form new stars. The other five clumps are only reliably detected in {sup 12}CO and have relatively small masses. Five clumps are located on the border of the ring structure, and four of them are elongated along the shell. This is well in agreement with the collect-and-collapse scenario. The detected velocity gradient reveals that the ring structure is still under expansion owing to stellar winds from the exciting star(s). Furthermore, 99 young stellar objects (YSOs) have been identified based on their infrared colors. A group of YSOs reside inside the ring, indicating active star formation in N6. Although no confirmative features of triggered star formation are detected, the bubble and the enclosed H II region have profoundly reconstructed the natal cloud and altered the dynamics therein.},

  doi          = {10.1088/0004-637X/797/1/40},

  url          = {https://www.osti.gov/biblio/22370044},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 797,

  place        = {United States},

  year         = {Wed Dec 10 00:00:00 EST 2014},

  month        = {Wed Dec 10 00:00:00 EST 2014}

}

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