The GBT Diffuse Ionized Gas Survey: Tracing the Diffuse Ionized Gas around the Giant Hii Region W43
文献类型：期刊论文
| 作者 | Luisi,Matteo3,4; Anderson,L. D.3,4,5; Liu,Bin6; Balser,Dana S.7; Bania,T. M.8; Wenger,Trey V.2; Haffner,L. M.1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-01-29 |
| 卷号 | 889期号:2 |
| 关键词 | Interstellar medium Galactic radio sources Radio astronomy Interstellar abundances HII regions Warm ionized medium Surveys Photodissociation regions |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab643e |
| 英文摘要 | Abstract The Green Bank Telescope Diffuse Ionized Gas Survey (GDIGS) is a fully sampled radio recombination line (RRL) survey of the inner Galaxy at C-band (4–8 GHz). We average together ～15 Hnα RRLs within the receiver bandpass to improve the spectral signal-to-noise ratio. The average beam size for the RRL observations at these frequencies is ～2′. We grid these data to have spatial and velocity spacings of 30″?and 0.5 , respectively. Here we discuss the first RRL data from GDIGS: a 6 deg2 area surrounding the Galactic H II region complex W43. We attempt to create a map devoid of emission from discrete H II regions and detect RRL emission from the diffuse ionized gas (DIG) across nearly the entire mapped area. We estimate the intensity of the DIG emission by a simple empirical model, taking only the H II region locations, angular sizes, and RRL intensities into account. The DIG emission is predominantly found at two distinct velocities: ～40 and ～100 . While the 100 component is associated with W43 at a distance of ～6 kpc, the origin of the 40 component is less clear. Since the distribution of the 40 emission cannot be adequately explained by ionizing sources at the same velocity, we hypothesize that the plasma at the two velocity components is interacting, placing the 40 DIG at a similar distance as the 100 emission. We find a correlation between dust temperature and integrated RRL intensity, suggesting that the same radiation field that heats the dust also maintains the ionization of the DIG. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-889-2-AB643E |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28515]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, FL 32114, USA 2.Dominion Radio Astrophysical Observatory, Herzberg Astronomy and Astrophysics Research Centre, National Research Council Canada, P.O. Box 248, Penticton, BC V2A 6J9, Canada 3.Department of Physics and Astronomy, West Virginia University, Morgantown, WV 26506, USA 4.Center for Gravitational Waves and Cosmology, West Virginia University, Chestnut Ridge Research Building, Morgantown, WV 26505, USA 5.Adjunct Astronomer at the Green Bank Observatory, P.O. Box 2, Green Bank, WV 24944, USA 6.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China 7.National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA 8.Institute for Astrophysical Research, Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA |
| 推荐引用方式 GB/T 7714 | Luisi,Matteo,Anderson,L. D.,Liu,Bin,et al. The GBT Diffuse Ionized Gas Survey: Tracing the Diffuse Ionized Gas around the Giant Hii Region W43[J]. The Astrophysical Journal,2020,889(2). |
| APA | Luisi,Matteo.,Anderson,L. D..,Liu,Bin.,Balser,Dana S..,Bania,T. M..,...&Haffner,L. M..(2020).The GBT Diffuse Ionized Gas Survey: Tracing the Diffuse Ionized Gas around the Giant Hii Region W43.The Astrophysical Journal,889(2). |
| MLA | Luisi,Matteo,et al."The GBT Diffuse Ionized Gas Survey: Tracing the Diffuse Ionized Gas around the Giant Hii Region W43".The Astrophysical Journal 889.2(2020). |
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来源：国家天文台
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