The malating 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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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' x 2' region at 14 '' (FWHM) resolution (corresponding to linear scales of similar to 0.2-1.0 kpc). The L-IR-L'(dense) 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, L-IR/L'(dense), shows systematic variations with L-IR within individual spatially resolved galaxies, whereas the galaxy-integrated ratios vary little. A rising trend is also found between L-IR/L'(dense) ratio and the warm-dust temperature gauged by the 70 mu m/100 mu m 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 (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 L'(HCN(4-3))/L'(HCO+(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.
National Key R&D Program of China 2017YFA0402700 2017YFA0402704 2016YFA0400702 Science and Technology Facilities Council of the United Kingdom JCMT Large Program M16AL007 NSFC 11420101002 11603075 11721303 Chinese Academy of Sciences Key Research Program of Frontier Sciences QYZDJ-SSW-SLH008 National Research Foundation of Korea 2015R1D1A1A01060516 Center for Galaxy Evolution Research 2010-0027910 Natural Sciences and Engineering Research Council of Canada ERC 321302 UK Science and Technology Facilities Council ST/M001008/1 National Science Centre, Poland, through the POLONEZ 2015/19/P/ST9/04010 European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant 665778 Ministry of Science and Technology (MoST) of Taiwan MoST 103-2112-M-001-032-MY3 MoST 106-2112-M-001-011 STFC National Natural Science Foundation of China U1631237 Yunnan Province of China 2017HC018 CAS
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Quote ItemAstrophysical Journal Volumen: 860 Número: 2 Número de artículo: 165
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