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

	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-Yu 1,2,3; Gao, Yu 1; Henkel, Christian 2,4; Zhao, Yinghe 1,5; Wang, Junzhi6 ; Menten, Karl M.2; Guesten, Rolf 2
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2014-04-01
卷号	784 期号:2 页码:31-35
关键词	galaxies: evolution galaxies: ISM infrared: galaxies ISM: molecules radio lines: galaxies
英文摘要	We 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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ULTRALUMINOUS INFRARED GALAXIES ; MOLECULAR GAS ; NEARBY GALAXIES ; CLOUDS ; CLUMPS ; SAMPLE ; LUMINOSITIES ; EMISSION ; SPITZER
收录类别	SCI
语种	英语
WOS记录号	WOS:000333333400014
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/16269]
专题	上海天文台_VLBI研究室
作者单位	1.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
推荐引用方式 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):31-35.
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),31-35.
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):31-35.