PMO OpenIR
Dense Gas in the Outer Spiral Arm of M51
Chen, Hao1,2,3; Braine, Jonathan4,5; Gao, Yu6,7; Koda, Jin8; Gu, Qiusheng1,2,3
2017-02-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume836Issue:1Pages:7
Corresponding AuthorChen, Hao(chenhao198701@yahoo.com) ; Gu, Qiusheng(qsgu@nju.edu.cn)
AbstractThere is a linear relation between the mass of dense gas traced by the HCN(1- 0) luminosity and the star formation rate (SFR) traced by the far-infrared luminosity. Recent observations of galactic disks have shown some systematic variations. In order to explore the SFR-dense gas link at high resolution (similar to 4 '', similar to 150 pc) in the outer disk of an external galaxy, we have mapped a region about 5 kpc from the center along the northern spiral arm of M51 in the HCN(1- 0), HCO+(1- 0), and HNC(1- 0) emission lines using the Northern Extended Millimeter Array interferometer. The HCN and HCO+ lines were detected in six giant molecular associations (GMAs), while HNC emission was only detected in the two brightest GMAs. One of the GMAs hosts a powerful H II region, and HCN is stronger than HCO+ there. Comparing observations of GMAs in the disks of M31 and M33 at similar angular resolution (similar to 100 pc), we find that GMAs in the outer disk of M51 are brighter in both the HCN and the HCO+ lines by a factor of 3, on average. However, the I-HCN /I-CO and I-HCO(+) /I-CO ratios are similar to the ratios in nearby galactic disks and the Galactic plane. Using the Herschel 70 mu m data to trace the total IR luminosity at the resolution of the GMAs, we find that both the LIR/LHCN and LIR/LHCO+ relations in the outer disk GMAs are consistent with the proportionality between the LIR and the dense gas mass established globally in galaxies within the scatter. The IR/HCN and IR/HCO+ ratios of the GMAs vary by a factor of 3, probably depending on whether massive stars are forming.
Keywordgalaxies: individual (M51, NGC 5194) galaxies: ISM galaxies: star formation ISM: molecules radio lines: galaxies
DOI10.3847/1538-4357/836/1/101
WOS KeywordSTAR-FORMATION EFFICIENCY ; LUMINOUS INFRARED GALAXIES ; MOLECULAR GAS ; ACTIVE GALAXIES ; FORMATION LAWS ; ULTRALUMINOUS GALAXIES ; MAGELLANIC CLOUDS ; NEARBY GALAXIES ; M33 HERM33ES ; FORMING GAS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000397304500053
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23187
Collection中国科学院紫金山天文台
Corresponding AuthorChen, Hao; Gu, Qiusheng
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China
3.Collaborat Innovat Ctr Modern Astron & Space Expl, Nanjing 210093, Peoples R China
4.Univ Bordeaux, Lab Astrophys Bordeaux, F-33270 Florac, France
5.CNRS, UMR 5804, LAB, F-33270 Florac, France
6.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Peoples R China
7.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China
8.SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA
Recommended Citation
GB/T 7714
Chen, Hao,Braine, Jonathan,Gao, Yu,et al. Dense Gas in the Outer Spiral Arm of M51[J]. ASTROPHYSICAL JOURNAL,2017,836(1):7.
APA Chen, Hao,Braine, Jonathan,Gao, Yu,Koda, Jin,&Gu, Qiusheng.(2017).Dense Gas in the Outer Spiral Arm of M51.ASTROPHYSICAL JOURNAL,836(1),7.
MLA Chen, Hao,et al."Dense Gas in the Outer Spiral Arm of M51".ASTROPHYSICAL JOURNAL 836.1(2017):7.
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