The ALMaQUEST Survey ⅩⅤ: The dependence of the molecular-to-atomic gas ratios on resolved optical diagnostics

作     者：Niankun Yu Zheng Zheng Chao-Wei Tsai Pei Zuo Sara L.Ellison David V.Stark Di Li Jingwen Wu Karen L.Masters Ting Xiao Yinghui Zheng Zongnan Li Kai Zhang Hongying Chen Shu Liu Sihan Jiao Fanyi Meng 

作者机构：National Astronomical ObservatoriesChinese Academy of Sciences Key Laboratory of Radio Astronomy and TechnologyChinese Academy of Sciences Institute for Frontiers in Astronomy and AstrophysicsBeijing Normal University School of Astronomy and Space ScienceUniversity of Chinese Academy of Sciences Department of Physics & AstronomyUniversity of Victoria Departments of Physics and AstronomyHaverford College Space Telescope Science Institute Zhejiang Laboratory New Cornerstone Science Laboratory School of PhysicsZhejiang University 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学:物理学 力学 天文学(英文版))

年 卷 期：2024年第Mechanics & Astronomy) .卷第9期

页      面：178-200页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11988101, 11973051, 12041302, 12373012, 11903003, and U1931110) the support by the National Natural Science Foundation of China (Grant No. 11973030) the China Postdoctoral Science Foundation (Grant Nos. 2022M723175, and GZB20230766) the International Partnership Program of Chinese Academy of Sciences (Grant No. 114A11KYSB20210010) the National Key Research and Program of China (Grant Nos. 2023YFE0110500, 2023YFA1608004, and 2023YFC2206403) the Ministry of Science and Technology of China (Grant No. 2022YFA1605300) supported by the Young Researcher Grant of Institutional Center for Shared Technologies and Facilities of National Astronomical Observatories, Chinese Academy of Sciences the fellowship of China National Postdoctoral Program for Innovation Talents (Grant No. BX20220301) supported by the project funded by China Postdoctoral Science Foundation (Grant No. 2021M703236) 

摘      要：The atomic-to-molecular gas conversion is a critical step in the baryon cycle of galaxies,which sets the initial conditions for subsequent star formation and influences the multi-phase interstellar *** compiled a sample of 94 nearby galaxies with observations of multi-phase gas contents by utilizing public HⅠ,CO,and optical IFU data from the Ma NGA survey together with new FAST HⅠ*** agreement with previous results,our sample shows that the global molecular-to-atomic gas ratio(Rmol≡log MH2/MHⅠ) is correlated with the global stellar mass surface density μ*with a Kendall s τ coefficient of 0.25 and p10-3,less tightly but still correlated with stellar mass and NUV-r color,and not related to the specific star formation rate（sSFR）.The cold gas distribution and kinematics inferred from the HⅠand CO global profile asymmetry and shape do not significantly rely on *** to the availability of kpc-scale observations of MaNGA,we decompose galaxies into HⅡ,composite,and AGN-dominated regions by using the BPT *** increasing Rmol,the fraction of HⅡregions within 1.5 effective radius decreases slightly;the density distribution in the spatially resolved BPT diagram also changes significantly,suggesting changes in metallicity and ionization *** with high Rmoltend to have high oxygen abundance,both at one effective radius with a Kendall s τ coefficient of 0.37(p10-3) and their central *** all parameters investigated here,the oxygen abundance at one effective radius has the strongest relation with global *** dependence of gas conversion on gas distribution and galaxy ionization states is *** contrast,the observed positive relation between oxygen abundance（μ*） and Rmolindicates that the gas conversion is efficient in regions of high metallicity（density）.