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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

Tan, QH, Gao, Y, Zhang, ZY, Greve, TR, Jiang, XJ, Wilson, CD, Yang, CT, Bemis, A, Chung, A, Matsushita, S, Shi, Y, Ao, YP, Brinks, E, Currie, MJ, Davis, TA, Grijs, RD, Ho, LC, Imanishi, M, Kohno, K, Lee, B , Parsons, H, Rawlings, MG, Rigopoulou, D, Rosolowsky, E, Bulger, J, Chen, H, Chapman, SC, Eden, DJ, Gear, WK, Gu, QS, He, JH, Jiao, Q, Liu, DZ, Liu, LJ, Li, XH, Michałowski, MJ, Nguyen-Luong, Q, Qiu, JJ, Smith, MWL, Violino, G, Wang, JF, Wang, JF, Wang, JZ, Yeh, S, Zhao, YH and Zhu, M (2018) 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. Astrophysical Journal, 860 (2). ISSN 0004-637X

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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.pdf - Published Version

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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. © 2018 IVEC 2017 - 18th International Vacuum Electronics Conference.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, 0306 Physical Chemistry (incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Date Deposited: 09 Oct 2019 09:25
Last Modified: 09 Oct 2019 09:30
DOI or Identification number: 10.3847/1538-4357/aac512
URI: http://researchonline.ljmu.ac.uk/id/eprint/11502

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