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

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        QingHua_Tan_et_al_The_MATALANG_Survey_Accepted_Manuscript.pdf (PDF, 1Mb)
        Author
        Tan, Qing-Hua
        Gao, Yu
        Zhang, Zhi-Yu
        Greve, Thomas R.
        Jiang, Xue-Jian
        Wilson, Christine D.
        Yang, Chen-Tao
        Bemis, Ashley
        Chung, Aeree
        Matsushita, Satoki
        Shi, Yong
        Ao, Yi-Ping
        Brinks, Elias
        Currie, Malcolm J.
        Davis, Timothy A.
        Grijs, Richard de
        Ho, Luis C.
        Imanishi, Masatoshi
        Kohno, Kotaro
        Lee, Bumhyun
        Parsons, Harriet
        Rawlings, Mark G.
        Rigopoulou, Dimitra
        Rosolowsky, Erik
        Bulger, Joanna
        Chen, Hao
        Chapman, Scott C.
        Eden, David
        Gear, Walter K.
        Gu, Qiu-Sheng
        He, Jin-Hua
        Jiao, Qian
        Liu, Dai-Zhong
        Liu, Li-Jie
        Li, Xiao-Hu
        Michalowski, Michal J.
        Nguyen-Luong, Quang
        Qiu, Jian-Jie
        Smith, Matthew W. L.
        Violino, Giulio
        Wang, Jian-Fa
        Wang, Jun-Feng
        Wang, Jun-Zhi
        Yeh, Sherry
        Zhao, Ying-He
        Zhu, Ming
        Attention
        2299/20273
        Abstract
        We present HCN J = 4→3 and HCO+ J = 4→3 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-Ldense relation, where the dense gas is traced by the HCN J = 4→3 and the HCO+ J = 4→3 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/Ldense, 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/Ldense 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 (SFE dense), appear to be nearly independent of the dense gas fraction ( f dense) for our sample of galaxies. The SFE of the total molecular gas (SFEmol) is found to increase substantially with f dense when combining our data with those on local (ultra)luminous infrared galaxies and high-z quasars. The mean LHCN(4-3) LHCO+(4-3) line ratio measured for the six targeted galaxies is 0.9±0.6. No significant correlation is found for the L'HCN(4-3) L'HCO+(4-3) ratio with the star formation rate as traced by L IR, nor with the warm-dust temperature, for the different populations of galaxies.
        Publication date
        2018-06-25
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/aac512
        Other links
        http://hdl.handle.net/2299/20273
        Metadata
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