The MALATANG Survey: The LGAS–LIR Correlation on Sub-kiloparsec Scale in Six Nearby Star-forming Galaxies as Traced by HCN J?=?4?→?3 and HCO+ J?=?4?→?3

doi:10.3847/1538-4357/aac512

CORC > 上海天文台 > 中国科学院上海天文台

	The MALATANG Survey: The LGAS–LIR Correlation on Sub-kiloparsec Scale in Six Nearby Star-forming Galaxies as Traced by HCN J?=?4?→?3 and HCO+ J?=?4?→?3
	Tan,Qing-Hua 39; Gao,Yu 39; Zhang,Zhi-Yu 37,38; Greve,Thomas R.36; Jiang,Xue-Jian 39; Wilson,Christine D.35; Yang,Chen-Tao 33,34,39; Bemis,Ashley 35; Chung,Aeree 32; Matsushita,Satoki 31
刊名	The Astrophysical Journal
	2018-06-25
卷号	860 期号:2
关键词	galaxies: ISM galaxies: star formation infrared: galaxies ISM: molecules radio lines: galaxies
ISSN号	0004-637X
DOI	10.3847/1538-4357/aac512
英文摘要	Abstract We present and maps of six nearby star-forming galaxies, NGC 253, NGC 1068, IC 342, M82, M83, and NGC 6946, obtained with the James Clerk Maxwell Telescope as part of the MALATANG survey. All galaxies were mapped in the central 2′?×?2′?region at 14″ (FWHM) resolution (corresponding to linear scales of ～0.2–1.0 kpc). The LIR–L′dense relation, where the dense gas is traced by the and the emission, measured in our sample of spatially resolved galaxies is found to follow the linear correlation established globally in galaxies within the scatter. We find that the luminosity ratio, LIR/L′dense, shows systematic variations with LIR within individual spatially resolved galaxies, whereas the galaxy-integrated ratios vary little. A rising trend is also found between LIR/L′dense ratio and the warm-dust temperature gauged by the 70 μm/100 μm flux ratio. We find that the luminosity ratios of IR/HCN (4–3) and IR/HCO+ (4–3), which can be taken as a proxy for the star formation efficiency (SFE) in the dense molecular gas (SFEdense), appear to be nearly independent of the dense gas fraction (fdense) for our sample of galaxies. The SFE of the total molecular gas (SFEmol) is found to increase substantially with fdense when combining our data with those on local (ultra)luminous infrared galaxies and high-z quasars. The mean line ratio measured for the six targeted galaxies is 0.9?±?0.6. No significant correlation is found for the ratio with the star formation rate as traced by LIR, nor with the warm-dust temperature, for the different populations of galaxies.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-860-2-AAC512
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32063]
专题	中国科学院上海天文台
作者单位	1.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People’s Republic of China 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China 3.W. M. Keck Observatory, 65-1120 Mamalahoa Hwy., Kamuela, HI 96743, USA 4.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China 5.Department of Astronomy, Xiamen University, 422 Siming South Road, Xiamen 361005, People’s Republic of China 6.CITA, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada 7.Korea Astronomy and Space Science Institute, 776 Daedeok daero, Yuseoung, Daejeon 34055, Republic of Korea 8.NAOJ Chile Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 9.Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. S?oneczna 36, 60-286 Poznań, Poland 10.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
推荐引用方式 GB/T 7714	Tan,Qing-Hua,Gao,Yu,Zhang,Zhi-Yu,et al. The MALATANG Survey: The LGAS–LIR Correlation on Sub-kiloparsec Scale in Six Nearby Star-forming Galaxies as Traced by HCN J?=?4?→?3 and HCO+ J?=?4?→?3[J]. The Astrophysical Journal,2018,860(2).
APA	Tan,Qing-Hua.,Gao,Yu.,Zhang,Zhi-Yu.,Greve,Thomas R..,Jiang,Xue-Jian.,...&Zhu,Ming.(2018).The MALATANG Survey: The LGAS–LIR Correlation on Sub-kiloparsec Scale in Six Nearby Star-forming Galaxies as Traced by HCN J?=?4?→?3 and HCO+ J?=?4?→?3.The Astrophysical Journal,860(2).
MLA	Tan,Qing-Hua,et al."The MALATANG Survey: The LGAS–LIR Correlation on Sub-kiloparsec Scale in Six Nearby Star-forming Galaxies as Traced by HCN J?=?4?→?3 and HCO+ J?=?4?→?3".The Astrophysical Journal 860.2(2018).