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题名: CO observations towards a sample of nearby galaxies
作者: Li, Fa-Cheng1, 2, 3; Wu, Yuan-Wei1, 2; Xu Ye(徐烨)1, 2
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2015-06-01
卷号: 15, 期号:6, 页码:785-801
关键词: galaxies: ISM ; molecules: galaxies ; millimeter lines: ISM ; star formation: ISM
学科分类: 天文和天体物理
DOI: 10.1088/1674-4527/15/6/002
文章类型: Article
英文摘要: We 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: STAR-FORMATION ; MOLECULAR GAS ; SPIRAL GALAXIES ; INFRARED GALAXIES ; CARBON-MONOXIDE ; (CO)-C-13 ; EMISSION ; CLOUDS ; LINE ; TELESCOPE
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000355138900002
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14904
Appears in Collections:紫金山天文台青海观测站_期刊论文

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作者单位: 1.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
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