The MALATANG survey: dense gas and star formation from high-transition HCN and HCO+ maps of NGC 253 | |
Jiang, Xue-Jian22; Greve, Thomas R.2,3; Gao, Yu22,23; Zhang, Zhi-Yu24; Tan, Qinghua22; de Grijs, Richard25,26,27; Ho, Luis C.28,29; Michalowski, Michal J.4; Currie, Malcolm J.5; Wilson, Christine D.6 | |
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 | 第15完成单位 |
文献子类 | Article |
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. |
学科主题 | 天文学 ; 星系与宇宙学 ; 星系天文学 ; 星系形成与演化 ; 恒星与银河系 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND |
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[2017YFA0402704, 2016YFA0400702, 2017YFA0402700] ; National Natural Science Foundation of China[11861131007, 11420101002, 11603075, 11721303, U1731237, 11933011, 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, 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 |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/23366] |
专题 | 云南天文台_丽江天文观测站(南方基地) |
通讯作者 | Jiang, Xue-Jian |
作者单位 | 1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China 2.Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK 3.Cosmic Dawn Center (DAWN), Technical University of Denmark, 2800 Kgs. Lyngby, Denmark 4.Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, PL-60-286 Poznan, Poland 5.RAL Space, Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, UK 6.Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada 7.Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK 8.Yunnan Observatories & Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China 9.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China 10.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, People’s Republic of 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. |
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