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

doi:10.1093/mnras/staa794

CORC > 新疆天文台 > 研究单元未命名 > 射电天文研究室 > 天体化学研究团组

	The MALATANG survey: dense gas and star formation from high-transition HCN and HCO+ maps of NGC 253
	Jiang, Xue-Jian 2,3; Greve, Thomas R.4,5; Gao, Yu 2,3,6; Zhang, Zhi-Yu 7; Tan, Qinghua 2,3; de Grijs, Richard 8,9,10; Ho, Luis C.1,11; Michalowski, Michal J.12; Currie, Malcolm J.13; Wilson, Christine D.14
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	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
DOI	10.1093/mnras/staa794
产权排序	29
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.
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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关键词	MOLECULAR GAS ; NEARBY GALAXIES ; SPIRAL GALAXIES ; STARBURST ; TRACERS ; LUMINOSITY ; NUCLEUS ; NGC-253
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000535885900100
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
内容类型	期刊论文
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.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210033, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, 10 Yuanhua Rd, Nanjing 210033, Peoples R China 4.UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England 5.Tech Univ Denmark, Cosm Dawn Ctr DAWN, DK-2800 Lyngby, Denmark 6.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 7.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany 8.Macquarie Univ, Dept Phys & Astron, Balaclava Rd, Sydney, NSW 2109, Australia 9.Macquarie Univ, Ctr Astron Astrophys & Astrophoton, Balaclava Rd, Sydney, NSW 2109, Australia 10.Int Space Sci Inst Beijing, Beijing 100190, Peoples R China
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.