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CO observations towards a sample of nearby galaxies
Li, Fa-Cheng1,2,3; Wu, Yuan-Wei1,2; Xu, Ye1,2
2015-06-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume15Issue:6Pages:785-801
AbstractWe have simultaneously observed (CO)-C-12, (CO)-C-13 and (CO)-O-18 (J = 1 - 0) rotational transitions in the centers of a sample of 58 nearby spiral galaxies using the 13.7-m millimeter-wave telescope administered by Purple Mountain Observatory. Forty-two galaxies were detected in (CO)-C-13 emission, but there was a null detection for (CO)-O-18 emission with a sigma upper limit of 2 mK. The central beam ratios, R, of (CO)-C-12 and (CO)-C-13 range mostly from 5 to 13, with an average value of 8.1 +/- 4.2, which is slightly lower than previous estimates for normal galaxies. Clear correlations are found between (CO)-C-12 and (CO)-C-13 luminosities. An average X factor of 1.44 +/- 0.84 x 10(20) cm(-2) (K km s(-1))(-1) is slightly lower than that in the Milky Way.
KeywordGalaxies: Ism Molecules: Galaxies Millimeter Lines: Ism Star Formation: Ism
Subject Area天文和天体物理
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/15/6/002
WOS KeywordSTAR-FORMATION ; MOLECULAR GAS ; SPIRAL GALAXIES ; INFRARED GALAXIES ; CARBON-MONOXIDE ; (CO)-C-13 ; EMISSION ; CLOUDS ; LINE ; TELESCOPE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000355138900002
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/14904
Collection紫金山天文台青海观测站
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Fa-Cheng,Wu, Yuan-Wei,Xu, Ye. CO observations towards a sample of nearby galaxies[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2015,15(6):785-801.
APA Li, Fa-Cheng,Wu, Yuan-Wei,&Xu, Ye.(2015).CO observations towards a sample of nearby galaxies.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,15(6),785-801.
MLA Li, Fa-Cheng,et al."CO observations towards a sample of nearby galaxies".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 15.6(2015):785-801.
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