PMO OpenIR  > 分子云与恒星形成研究团组
CO observations of the Galactic bubble N4
Li, Jun-Yu1,2; Jiang, Zhi-Bo1; Liu, Yao1; Wang, Yuan1
Corresponding AuthorLi, JY (reprint author), Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China. Email:
AbstractWe present a study of the Galactic bubble N4 using the 13.7 m millimeter-wave telescope, which is managed by Purple Mountain Observatory at Qinghai Station. N4 is one of the science demonstration regions where simultaneous observations of (CO)-C-12 (J = 1 - 0), (CO)-C-13 (J = 1 - 0) and (CO)-O-18 (J = 1 - 0) line emission towards N4 were carried out under the project Milky Way Imaging Scroll Painting (MWISP). We analyze the spectral profile and the distribution of the molecular gas. Morphologically, the CO emissions correlate well with Spitzer IRAC 8.0 mu m emission. The channel map and velocity-position diagram show that N4 is more likely to be an inclined expanding ring rather than a spherical bubble. We calculated the physical parameters of N4 including mass, size, column density and optical depth. Some massive star candidates were discovered in the region of N4 using the (J, J - H) color-magnitude diagram. We found a candidate for the energy source driving the expansion of N4, a massive star with a mass of similar to 15 M-circle dot and an age of similar to 1 Myr. There is the signature of infall motion in N4, which can be a good candidate for the infall area. Combining millimeter and infrared data, we suggest that triggered star formation can exist in N4.
KeywordIsm: Bubbles Ism: Clouds Molecules Stars: Formation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000323688500004
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Jun-Yu,Jiang, Zhi-Bo,Liu, Yao,et al. CO observations of the Galactic bubble N4[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(8):921-934.
APA Li, Jun-Yu,Jiang, Zhi-Bo,Liu, Yao,&Wang, Yuan.(2013).CO observations of the Galactic bubble N4.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(8),921-934.
MLA Li, Jun-Yu,et al."CO observations of the Galactic bubble N4".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.8(2013):921-934.
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