An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud

doi:10.3847/1538-4365/ab3576

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	An ATCA Survey of HI Absorption in the Magellanic Clouds. I. H I Gas Temperature Measurements in the Small Magellanic Cloud
	Jameson, Katherine E.2; McClure-Griffiths, N. M.2; Liu, Boyang 1,3; Dickey, John M.4; Staveley-Smith, Lister 1,5; Stanimirovic, Snezana 6; Dempsey, James 2,7; Dawson, J. R.8,9; Denes, Helga 10; Bolatto, Alberto D.11
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	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.
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关键词	NEUTRAL ATOMIC PHASES ; INTERSTELLAR-MEDIUM ; LINE SURVEY ; HYDROGEN
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000485151900003
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)
内容类型	期刊论文
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.