H II REGION G46.5-0.2: THE INTERPLAY BETWEEN IONIZING RADIATION, MOLECULAR GAS, AND STAR FORMATION
文献类型:期刊论文
作者 | Paron, S.1,2; Ortega, M. E.1; Dubner, G.1; Yuan, Jing-Hua3; Petriella, A.1; Giacani, E.1,2; Li, Jin Zeng3; Wu, Yuefang4; Liu, Hongli3; Huang, Ya Fang3 |
刊名 | ASTRONOMICAL JOURNAL |
出版日期 | 2015-06-01 |
卷号 | 149期号:6 |
关键词 | H II regions ISM: clouds ISM: molecules stars: formation |
英文摘要 | H II regions are particularly interesting because they can generate dense layers of gas and dust, elongated columns or pillars of gas pointing toward the ionizing sources, and cometary globules of dense gas where triggered star formation can occur. Understanding the interplay between the ionizing radiation and the dense surrounding gas is very important to explain the origin of these peculiar structures, and hence to characterize triggered star formation. G46.5-0.2 (G46), a poorly studied galactic H II region located at about 4 kpc, is an excellent target for performing this kind of study. Using public molecular data extracted from the Galactic Ring Survey ((CO)-C-13 J = 1-0) and from the James Clerk Maxwell Telescope data archive ((CO)-C-12, (CO)-C-13, (CO)-O-18 J - 3-2, HCO+, and HCN J - 4-3), and infrared data from the GLIMPSE and MIPSGAL surveys, we perform a complete study of G46, its molecular environment, and the young stellar objects (YSOs) placed around it. We found that G46, probably excited by an O7V star, is located close to the edge of the GRSMC G046.34-00.21 molecular cloud. It presents a horse-shoe morphology opening in the direction of the cloud. We observed a filamentary structure in the molecular gas likely related to G46 and not considerable molecular emission toward its open border. We found that about 10' to the southwest of G46 there are some pillar-like features, shining at 8 mu m and pointing toward the H II region open border. We propose that the pillar-like features were carved and sculpted by the ionizing flux from G46. We found several YSOs likely embedded in the molecular cloud grouped in two main concentrations: one, closer to the G46 open border consisting of Class II type sources, and another mostly composed of Class I type YSOs located just ahead of the pillar-like features, strongly suggesting an age gradient in the YSO distribution. |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000355250400016 |
源URL | [http://ir.bao.ac.cn/handle/114a11/5684] |
专题 | 国家天文台_应用天文研究部 |
作者单位 | 1.Inst Astron & Fis Espacio, CONICET UBA, RA-1428 Buenos Aires, DF, Argentina 2.Univ Buenos Aires, FADU, Buenos Aires, DF, Argentina 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Peking Univ, Dept Astron, Beijing 100871, Peoples R China |
推荐引用方式 GB/T 7714 | Paron, S.,Ortega, M. E.,Dubner, G.,et al. H II REGION G46.5-0.2: THE INTERPLAY BETWEEN IONIZING RADIATION, MOLECULAR GAS, AND STAR FORMATION[J]. ASTRONOMICAL JOURNAL,2015,149(6). |
APA | Paron, S..,Ortega, M. E..,Dubner, G..,Yuan, Jing-Hua.,Petriella, A..,...&Zhang, Si-Ju.(2015).H II REGION G46.5-0.2: THE INTERPLAY BETWEEN IONIZING RADIATION, MOLECULAR GAS, AND STAR FORMATION.ASTRONOMICAL JOURNAL,149(6). |
MLA | Paron, S.,et al."H II REGION G46.5-0.2: THE INTERPLAY BETWEEN IONIZING RADIATION, MOLECULAR GAS, AND STAR FORMATION".ASTRONOMICAL JOURNAL 149.6(2015). |
入库方式: OAI收割
来源:国家天文台
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