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DENSE GAS TRACERS AND STAR FORMATION LAWS IN ACTIVE GALAXIES: APEX SURVEY OF HCN J=4 -> 3, HCO+ J=4 -> 3, AND CS J=7 -> 6
Zhang, Zhi-Yu1,2,3; Gao, Yu1; Henkel, Christian2,4; Zhao, Yinghe1,5; Wang, Junzhi6; Menten, Karl M.2; Guesten, Rolf2
2014-04-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume784Issue:2Pages:0
AbstractWe report HCN J = 4 --> 3, HCO+ J = 4 --> 3, and CS J = 7 --> 6 observations in 20 nearby star-forming galaxies with the Atacama Pathfinder EXperiment 12 m telescope. Combined with four HCN, three HCO+, and four CS detections from the literature, we probe the empirical link between the luminosity of molecular gas (L'(gas)) and that of infrared emission (L-IR), up to the highest gas densities (similar to 10(6) cm(-3)) that have been probed so far. For nearby galaxies with large radii, we measure the IR luminosity within the submillimeter beam size (14 ''-18 '') to match the molecular emission. We find linear slopes for L'(CS J=7-6)-L-IR and L'(HCNJ=4-3)-L-IR, and a slightly super-linear slope for L'(HCO+ J=4-3)-L-IR. The correlation of L'(CS J=7-6)-L-IR even extends over eight orders of luminosity magnitude down to Galactic dense cores, with a fit of log(L-IR) = 1.00(+/-0.01)xlog(L'(CS J=7-6)) + 4.03(+/-0.04). Such linear correlations appear to hold for all densities >10(4) cm(-3), and indicate that star formation rate is not related to the free-fall timescale for dense molecular gas.
KeywordGalaxies: Evolution Galaxies: Ism Infrared: Galaxies Ism: Molecules Radio Lines: Galaxies
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/784/2/L31
WOS KeywordULTRALUMINOUS INFRARED GALAXIES ; MOLECULAR GAS ; NEARBY GALAXIES ; CLOUDS ; CLUMPS ; SAMPLE ; LUMINOSITIES ; EMISSION ; SPITZER
URL查看原文
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000333333400014
Citation statistics
Cited Times:40[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10698
Collection星系中的恒星形成研究团组
Affiliation1.Acad Sinica, Purple Mt Observ, Key Lab Radio Astron, Nanjing 210008, Peoples R China
2.Max Planck Inst Radioastron, D-53121 Bonn, Germany
3.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
4.King Abdulaziz Univ, Dept Astron, Jeddah 21413, Saudi Arabia
5.CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA
6.Shanghai Astron Observ, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Zhi-Yu,Gao, Yu,Henkel, Christian,et al. DENSE GAS TRACERS AND STAR FORMATION LAWS IN ACTIVE GALAXIES: APEX SURVEY OF HCN J=4 -> 3, HCO+ J=4 -> 3, AND CS J=7 -> 6[J]. ASTROPHYSICAL JOURNAL LETTERS,2014,784(2):0.
APA Zhang, Zhi-Yu.,Gao, Yu.,Henkel, Christian.,Zhao, Yinghe.,Wang, Junzhi.,...&Guesten, Rolf.(2014).DENSE GAS TRACERS AND STAR FORMATION LAWS IN ACTIVE GALAXIES: APEX SURVEY OF HCN J=4 -> 3, HCO+ J=4 -> 3, AND CS J=7 -> 6.ASTROPHYSICAL JOURNAL LETTERS,784(2),0.
MLA Zhang, Zhi-Yu,et al."DENSE GAS TRACERS AND STAR FORMATION LAWS IN ACTIVE GALAXIES: APEX SURVEY OF HCN J=4 -> 3, HCO+ J=4 -> 3, AND CS J=7 -> 6".ASTROPHYSICAL JOURNAL LETTERS 784.2(2014):0.
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