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, 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 ORCID: https://orcid.org/0000-0003-4932-9379, De Grijs, Richard, 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 ORCID: https://orcid.org/0000-0001-6789-6196, Gu, Qiu-Sheng, He, Jin-Hua, Jiao, Qian, Liu, Dai-Zhong, Liu, Li-Jie, Li, Xiao-Hu, Michalowski, Micha l J., Nguyen-Luong, Quang, Qiu, Jian-Jie, Smith, Matthew ORCID: https://orcid.org/0000-0002-3532-6970, Violino, Giulio, Wang, Jian-Fa, Wang, Jun-Feng, Wang, Jun-Zhi, Yeh, Sherry, Zhao, Ying-He and 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. Astrophysical Journal 860 (2) , 165. 10.3847/1538-4357/aac512

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Abstract

The Astrophysical Journal The American Astronomical Society, find out more. The Institute of Physics, find out more. A publishing partnership The following article isFree article 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 Qing-Hua Tan, Yu Gao, Zhi-Yu Zhang, Thomas R. Greve, Xue-Jian Jiang, Christine D. Wilson, Chen-Tao Yang, Ashley Bemis, Aeree Chung, Satoki MatsushitaShow full author list Published 2018 June 25 • © 2018. The American Astronomical Society. All rights reserved. The Astrophysical Journal, Volume 860, Number 2 Citation Qing-Hua Tan et al 2018 ApJ 860 165 DOI 10.3847/1538-4357/aac512 DownloadArticle PDF DownloadArticle ePub Authors Figures Tables References Article metrics 1960 Total downloads 4545 total citations on Dimensions. Permissions Get permission to re-use this article Share this article Article information 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	American Astronomical Society
ISSN:	0004-637X
Date of First Compliant Deposit:	14 May 2018
Date of Acceptance:	12 May 2018
Last Modified:	04 Feb 2025 16:15
URI:	https://orca.cardiff.ac.uk/id/eprint/111413

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