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题名: SPATIALLY RESOLVED DENSE MOLECULAR GAS AND STAR FORMATION RATE IN M51
作者: Chen, Hao1, 2, 3; Gao Yu(高煜)4, 5; Braine, Jonathan6, 7; Gu, Qiusheng1, 2, 3
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-09-10
卷号: 810, 期号:2, 页码:140
关键词: galaxies: individual (M51, NGC 5194) ; galaxies: ISM ; ISM: molecules ; radio lines: galaxies
学科分类: 天文和天体物理
DOI: 10.1088/0004-637X/810/2/140
文章类型: Article
英文摘要: We present the spatially resolved observations of HCN J = 1-0 emission in the nearby spiral galaxy M51 using the IRAM 30 m telescope. The HCN map covers an extent of 4' x 5', which is, so far, the largest in M51 with a spatial resolution of 28 ''. There is a correlation between infrared emission (an indication of star formation rate (SFR)) and HCN (1-0) emission (a dense gas tracer) on a kiloparsec scale in M51, a natural extension of the proportionality between the SFR and the dense gas mass established globally in galaxies. Within M51, the relation appears to be sub-linear (with a slope of 0.74 +/- 0.16) as L-IR rises less quickly than L-HCN. We attribute this to a difference between center and outer disk such that the central regions have stronger HCN (1-0) emission per unit star formation. The IR-HCN correlation in M51 is further compared with global ones from the Milky Way to high-z galaxies and bridges the gap between giant molecular clouds and galaxies. Like the centers of nearby galaxies, the L-IR/L-HCN ratio measured in M51 (particularly in the central regions) is slightly lower than what is measured globally in galaxies, yet is still within the scatter. This implies that though the L-IR/L-HCN ratio varies as a function of physical environment in the different positions of M51, IR, and HCN indeed show a linear correlation over 10 orders of magnitude.
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 ; ACTIVE GALACTIC NUCLEUS ; NEARBY GALAXIES ; FORMATION LAW ; DEPLETION TIME ; INTERSTELLAR-MEDIUM ; PHYSICAL CONDITIONS ; HCN OBSERVATIONS ; NGC-5194 M51A ; SPIRAL GALAXY
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000362083700056
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14843
Appears in Collections:星系中的恒星形成研究团组_期刊论文

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作者单位: 1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, 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, Purple Mt Observ, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
6.Univ Bordeaux, Lab Astrophys Bordeaux, F-33270 Florac, France
7.CNRS, LAB, UMR 5804, F-33270 Florac, France
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