THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A | |
Shi, Yong1,2,3; Wang, Junzhi4,5![]() | |
刊名 | ASTROPHYSICAL JOURNAL LETTERS
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2015-05-01 | |
卷号 | 804期号:1页码:1 |
关键词 | galaxies: dwarf galaxies: ISM submillimeter: ISM |
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 |
语种 | 英语 |
WOS记录号 | WOS:000353819400011 |
公开日期 | 2015-08-18 |
内容类型 | 期刊论文 |
源URL | [http://119.78.226.72/handle/331011/18239] ![]() |
专题 | 上海天文台_射电天文重点实验 |
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 |
推荐引用方式 GB/T 7714 | Shi, Yong,Wang, Junzhi,Zhang, Zhi-Yu,et al. THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A[J]. ASTROPHYSICAL JOURNAL LETTERS,2015,804(1):1. |
APA | Shi, Yong.,Wang, Junzhi.,Zhang, Zhi-Yu.,Gao, Yu.,Armus, Lee.,...&Stierwalt, Sabrina.(2015).THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A.ASTROPHYSICAL JOURNAL LETTERS,804(1),1. |
MLA | Shi, Yong,et al."THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A".ASTROPHYSICAL JOURNAL LETTERS 804.1(2015):1. |
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