Ionization Profiles of Galactic H ii Regions
文献类型：期刊论文
| 作者 | Luisi,Matteo1,2; Anderson,L. D.1,2,3; Liu,Bin4; Roshi,D. Anish5; Churchwell,Ed6 |
| 刊名 | The Astrophysical Journal Supplement Series
 |
| 出版日期 | 2019-02-20 |
| 卷号 | 241期号:1 |
| ISSN号 | 0067-0049 |
| 关键词 | Hii regions ISM: abundances ISM: bubbles photon-dominated region (PDR) radio lines: ISM |
| DOI | 10.3847/1538-4365/aaf6a5 |
| 英文摘要 | Abstract Using Green Bank Telescope radio recombination line (RRL) data, we analyze the role of leaking radiation from H ii regions in maintaining the ionization of the interstellar medium (ISM). We observed a sample of eight Galactic H ii regions of various sizes, morphologies, and luminosities. For each region, the hydrogen RRL intensity decreases roughly as a power-law with the distance from the center of the region. This suggests that radiation leaking from the H ii region is responsible for the majority of surrounding ionized gas producing RRL emission. Our results further indicate that the hydrogen RRL intensity appears to be fundamentally related to the H ii region sizes traced by their photodissociation regions, such that physically smaller H ii regions show a steeper decrease in intensity with an increasing distance from the region centers. As a result, giant H ii regions may have a much larger effect in maintaining the ionization of the ISM. For six of the eight observed H ii regions, we find a decrease in the 4He+/H+ abundance ratio with an increasing distance, indicating that He-ionizing photons are being absorbed within the ionization front of the H ii region. There is enhanced carbon RRL emission toward directions with strong continuum background, suggesting that the carbon emission is amplified by stimulated emission. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0067-0049-241-1-AAF6A5 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/25122]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA 2.Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV 26505, USA 3.Adjunct Astronomer at the Green Bank Observatory, P.O. Box 2, Green Bank, WV 24944, USA 4.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China 5.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA 6.Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706-1507, USA |
| 推荐引用方式 GB/T 7714 | Luisi,Matteo,Anderson,L. D.,Liu,Bin,et al. Ionization Profiles of Galactic H ii Regions[J]. The Astrophysical Journal Supplement Series,2019,241(1). |
| APA | Luisi,Matteo,Anderson,L. D.,Liu,Bin,Roshi,D. Anish,&Churchwell,Ed.(2019).Ionization Profiles of Galactic H ii Regions.The Astrophysical Journal Supplement Series,241(1). |
| MLA | Luisi,Matteo,et al."Ionization Profiles of Galactic H ii Regions".The Astrophysical Journal Supplement Series 241.1(2019). |
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来源：国家天文台
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