An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud
文献类型：期刊论文
| 作者 | Jameson, Katherine E.2; McClure-Griffiths, N. M.2; Liu, Boyang1,3; Dickey, John M.4; Staveley-Smith, Lister1,5; Stanimirovic, Snezana6; Dempsey, James2,7; Dawson, J. R.8,9; Denes, Helga10; Bolatto, Alberto D.11 |
| 刊名 | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
 |
| 出版日期 | 2019-09-01 |
| 卷号 | 244期号:1页码:17 |
| 关键词 | galaxies: ISM ISM: clouds Magellanic Clouds radio lines: ISM |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/ab3576 |
| 英文摘要 | We present the first results from the Small Magellanic Cloud portion of a new Australia Telescope Compact Array H I absorption survey of both of the Magellanic Clouds, comprising over 800 hr of observations. Our new H I absorption line data allow us to measure the temperature and fraction of cold neutral gas in a low-metallicity environment. We observed 22 separate fields, targeting a total of 55 continuum sources, against 37 of which we detected H I absorption; from this we measure a column-density-weighted mean average spin temperature of < T-s >= 150 K. Splitting the spectra into individual absorption line features, we estimate the temperatures of different gas components and find an average cold gas temperature of similar to 30 K for this sample, lower than the average of similar to 40 K in the Milky Way. The H I appears to be evenly distributed throughout the SMC, and we detect absorption in 67% of the lines of sight in our sample, including some outside the main body of the galaxy (N-H I > 2 x 10(21) cm(-2)). The optical depth and temperature of the cold neutral atomic gas show no strong trend with location spatially or in velocity. Despite the low-metallicity environment, we find an average cold gas fraction of similar to 20%, not dissimilar from that of the Milky Way. |
| WOS关键词 | NEUTRAL ATOMIC PHASES ; INTERSTELLAR-MEDIUM ; LINE SURVEY ; HYDROGEN |
| 资助项目 | Australian Government ; Australian Research Council[FT150100024] ; National Key R&D Program of China[2017YFA0402600] ; CAS International Partnership Program[114A11KYSB20160008] ; Australian Research Council (ARC) DECRA Fellowship[DE170101086] ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)[CE170100013] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000485151900003 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Australian Government ; Australian Government ; Australian Research Council ; Australian Research Council ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Government ; Australian Government ; Australian Research Council ; Australian Research Council ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Government ; Australian Government ; Australian Research Council ; Australian Research Council ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Government ; Australian Government ; Australian Research Council ; Australian Research Council ; National Key R&D Program of China ; National Key R&D Program of China ; CAS International Partnership Program ; CAS International Partnership Program ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council (ARC) DECRA Fellowship ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) ; Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/27710]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Jameson, Katherine E. |
| 作者单位 | 1.Univ Western Australia, ICRAR, Crawley, WA 6009, Australia 2.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Univ Tasmania, Sch Nat Sci, Private Bag 37, Hobart, Tas 7001, Australia 5.ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Melbourne, Vic, Australia 6.Univ Wisconsin, Dept Astron, Madison, WI 53706 USA 7.CSIRO, Informat Management & Technol, POB 225, Dickson, ACT 2602, Australia 8.Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia 9.Macquarie Univ, MQ Res Ctr Astron Astrophys & Astrophoton, N Ryde, NSW 2109, Australia 10.Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands |
| 推荐引用方式 GB/T 7714 | Jameson, Katherine E.,McClure-Griffiths, N. M.,Liu, Boyang,et al. An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2019,244(1):17. |
| APA | Jameson, Katherine E..,McClure-Griffiths, N. M..,Liu, Boyang.,Dickey, John M..,Staveley-Smith, Lister.,...&Wong, Tony.(2019).An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,244(1),17. |
| MLA | Jameson, Katherine E.,et al."An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 244.1(2019):17. |
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来源：国家天文台
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