THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A

	THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A
	Shi, Yong 1,2,3; Wang, Junzhi 4,5; Zhang, Zhi-Yu 6,7; Gao, Yu8 ; Armus, Lee 9; Helou, George 9; Gu, Qiusheng 1,2,3; Stierwalt, Sabrina 10
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2015-05-01
卷号	804 期号:1 页码:L11
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.
学科主题	天文和天体物理
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
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/14862]
专题	中国科学院紫金山天文台
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):L11.
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),L11.
MLA	Shi, Yong,et al."THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A".ASTROPHYSICAL JOURNAL LETTERS 804.1(2015):L11.