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THE WEAK CARBON MONOXIDE EMISSION IN AN EXTREMELY METAL-POOR GALAXY, SEXTANS A
Shi, Yong1,2,3; Wang, Junzhi4,5; Zhang, Zhi-Yu6,7; Gao, Yu8; Armus, Lee9; Helou, George9; Gu, Qiusheng1,2,3; Stierwalt, Sabrina10
2015-05-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume804Issue:1Pages:L11
AbstractCarbon 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.
KeywordGalaxies: Dwarf Galaxies: Ism Submillimeter: Ism
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/804/1/L11
WOS KeywordCO-TO-H-2 CONVERSION FACTOR ; STAR-FORMATION ; LOW-METALLICITY ; MOLECULAR GAS ; DUST ; MASS ; CLOUDS ; CO
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000353819400011
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14862
Collection星系宇宙学和暗能量研究团组
Affiliation1.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
Recommended Citation
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.
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