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题名: THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A
作者: Shi, Yong1, 2, 3; Wang, Junzhi4, 5; Zhang, Zhi-Yu6, 7; Gao Yu(高煜)8; Armus, Lee9; Helou, George9; Gu, Qiusheng1, 2, 3; Stierwalt, Sabrina10
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2015-05-01
卷号: 804, 期号:1, 页码:L11
关键词: galaxies: dwarf ; galaxies: ISM ; submillimeter: ISM
学科分类: 天文和天体物理
DOI: 10.1088/2041-8205/804/1/L11
文章类型: Article
英文摘要: Carbon monoxide (CO) is one of the primary coolants of gas and an easily accessible tracer of molecular gas in spiral galaxies, but it is unclear if CO plays a similar role in metal-poor dwarfs. We carried out a deep observation with IRAM 30 m to search for CO emission by targeting the brightest far-IR peak in a nearby extremely metal-poor galaxy, Sextans A, with 7% solar metallicity. A marginal signal of CO J = 1 - 0 emission is seen, which is already faint enough to place a strong constraint on the conversion factor (alpha(CO)) from the CO luminosity to the molecular gas mass that is derived from the spatially resolved dust-mass map. The alpha(CO) is at least seven hundred times the Milky Way value. This indicates that CO emission is exceedingly weak in Sextans A, challenging its role as a coolant in extremely metal-poor galaxies.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: CO-TO-H-2 CONVERSION FACTOR ; STAR-FORMATION ; LOW-METALLICITY ; MOLECULAR GAS ; DUST ; MASS ; CLOUDS ; CO
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000353819400011
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14862
Appears in Collections:星系宇宙学和暗能量研究团组_期刊论文

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作者单位: 1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
3.Collaborat Innovat Ctr Modern Astron & Space Expl, Nanjing 210093, Jiangsu, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
6.Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
7.ESO, D-85748 Munich, Germany
8.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
9.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
10.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
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