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The MALATANG survey: dense gas and star formation from high-transition HCN and HCO+ maps of NGC 253

文献类型：期刊论文

作者Jiang, Xue-Jian31,32; Greve, Thomas R.29,30; Gao, Yu28,31,32; Zhang, Zhi-Yu27; Tan, Qinghua31,32; de Grijs, Richard24,25,26; Ho, Luis C.22,23; Michalowski, Michal J.21; Currie, Malcolm J.20; Wilson, Christine D.19
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2020-05-01
卷号494期号:1页码:1276-1296
关键词ISM: molecules galaxies: individual: NGC 253 galaxies: ISM galaxies: star formation submillimetre: ISM
ISSN号0035-8711
DOI10.1093/mnras/staa794
通讯作者Jiang, Xue-Jian(x.jiang@eaobservatory.org)
英文摘要To study the high-transition dense-gas tracers and their relationships to the star formation of the inner similar to 2 kpc circumnuclear region of NGC 253, we present HCN J = 4-3 and HCO+ J = 4-3 maps obtained with the James Clerk Maxwell Telescope. Using the spatially resolved data, we compute the concentration indices r(90)/r(50) for the different tracers. HCN and HCO+ 4-3 emission features tend to be centrally concentrated, which is in contrast to the shallower distribution of CO 1-0 and the stellar component. The dense-gas fraction (f(dense), traced by v the velocity-integrated-intensity ratios of HCN/CO and HCO+/CO) and the ratio R-31 (CO 3-2 / 1 -0) decline towards larger galactocentric distances, but increase with higher star formation rate surface density. The radial variation and the large scatter of f(dense )- dense and R31 imply distinct physical conditions in different regions of the galactic disc. The relationships of f(dense) versus Sigma(stellar) and SFEdense versus Sigma(stellar) are explored. SFEdense increases with higher Sigma(stellar) in this galaxy, which is inconsistent with previous work that used HCN 1-0 data. This implies that existing stellar components might have different effects on the high-J HCN and HCO+ than their low-J emission. We also find that SFE(dense )seems to be decreasing with higher f(dense) which is consistent with previous works, and it suggests that the ability of the dense gas to form stars diminishes when the average density of the gas increases. This is expected in a scenario where only the regions with high-density contrast collapse and form stars.
WOS关键词MOLECULAR GAS ; NEARBY GALAXIES ; SPIRAL GALAXIES ; STARBURST ; TRACERS ; LUMINOSITY ; NUCLEUS ; NGC-253
资助项目National Key R&D Program of China[2017YFA0402704] ; National Key R&D Program of China[2016YFA0400702] ; National Key R&D Program of China[2017YFA0402700] ; National Natural Science Foundation of China[11861131007] ; National Natural Science Foundation of China[11420101002] ; National Natural Science Foundation of China[11603075] ; National Natural Science Foundation of China[11721303] ; National Natural Science Foundation of China[U1731237] ; National Natural Science Foundation of China[11933011] ; National Natural Science Foundation of China[11673057] ; Chinese Academy of Sciences Key Research Program of Frontier Sciences[QYZDJSSW-SLH008] ; National Science Centre, Poland[2018/30/E/ST9/00208] ; Natural Sciences and Engineering Research Council of Canada ; Canada Research Chairs program ; NSFC[11873086] ; NSFC[U1631237] ; Yunnan Province of China[2017HC018] ; Ministry of Science and Technology (MOST) of Taiwan[MOST 107-2119-M-001-020] ; Chinese Academy of Sciences (CAS) ; Science and Technology Facilities Council of the United Kingdom
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000535885900100
出版者OXFORD UNIV PRESS
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Key Research Program of Frontier Sciences ; National Science Centre, Poland ; Natural Sciences and Engineering Research Council of Canada ; Canada Research Chairs program ; NSFC ; Yunnan Province of China ; Ministry of Science and Technology (MOST) of Taiwan ; Chinese Academy of Sciences (CAS) ; Science and Technology Facilities Council of the United Kingdom
源URL[http://ir.xao.ac.cn/handle/45760611-7/3494]  
专题天体化学研究团组
通讯作者Jiang, Xue-Jian
作者单位1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China
2.Liverpool John Moores Univ, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
3.Chinese Acad Sci, Key Lab Radio Astron, Beijing 100012, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
5.East Asian Observ, 660 N Aohoko Pl, Hilo, HI 96720 USA
6.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
7.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
8.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
9.Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, Wales
10.Yonsei Univ, Dept Astron, 50 Yonsei Ro, Seoul 03722, South Korea
推荐引用方式
GB/T 7714		 Jiang, Xue-Jian,Greve, Thomas R.,Gao, Yu,et al. The MALATANG survey: dense gas and star formation from high-transition HCN and HCO+ maps of NGC 253[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,494(1):1276-1296.
APA Jiang, Xue-Jian.,Greve, Thomas R..,Gao, Yu.,Zhang, Zhi-Yu.,Tan, Qinghua.,...&Li, Xiaohu.(2020).The MALATANG survey: dense gas and star formation from high-transition HCN and HCO+ maps of NGC 253.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,494(1),1276-1296.
MLA Jiang, Xue-Jian,et al."The MALATANG survey: dense gas and star formation from high-transition HCN and HCO+ maps of NGC 253".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 494.1(2020):1276-1296.

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