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On the Cooling Flow Problem in the Gaseous Halo of the Milky Way
Fang, Xiang-Er1; Guo, Fulai2,3; Yuan, Ye-Fei1
2020-05-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume894Issue:1Pages:11
AbstractTheoretical and observational arguments suggest that there is a large amount of hot (similar to 10(6) K) diffuse gas residing in the Milky Way (MW) halo, but its total mass and spatial distribution are still unclear. In this work, we present a general model for the gas density distribution in the Galactic halo, and investigate the gas evolution under radiative cooling with a series of 2D hydrodynamic simulations. We find that the mass inflow rate in the developed cooling flow increases with gas metallicity and the total gas mass in the halo. For a fixed halo gas mass, the spatial gas distribution affects the onset time of the cooling catastrophe, which starts earlier when the gas distribution is more centrally peaked, but does not substantially affect the final mass inflow rate. The gravity from the Galactic bulge and disk affects gas properties in the inner regions, but has little effect on the final inflow rate either. We confirm our results by investigating cooling flows in several density models adopted from the literature, including the Navarro-Frenk-White (NFW) model, the cored-NFW model, the Maller & Bullock model, and the beta model. Typical mass inflow rates in our simulations range from similar to 5 M yr(-1) to similar to 60 M yr(-1), and are much higher than the observed star formation rate in our Galaxy, suggesting that stellar and active galactic nucleus feedback processes may play important roles in the evolution of the MW and MW-type galaxies.
KeywordCircumgalactic medium Hydrodynamical simulations Galaxy physics the Milky Way Plasma astrophysics Galaxy evolution Cooling flows Galaxy processes
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences
DOI10.3847/1538-4357/ab846c
WOS KeywordHIGH-VELOCITY CLOUDS ; X-RAY SPECTROSCOPY ; HOT GAS ; LOCAL GROUP ; CLUSTERS ; GALAXIES ; STARS
Language英语
Funding ProjectNational Natural Science Foundation of China[11873072] ; National Natural Science Foundation of China[11633006] ; National Natural Science Foundation of China[11725312] ; National Natural Science Foundation of China[11421303] ; Natural Science Foundation of Shanghai[18ZR1447100] ; Chinese Academy of Sciences[QYZDB-SSW-SYS033] ; Chinese Academy of Sciences[QYZDJ-SSW-SYS008]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Shanghai ; Natural Science Foundation of Shanghai ; Chinese Academy of Sciences ; Chinese Academy of Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000531272800001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/54948
Collection中国科学院国家天文台
Corresponding AuthorGuo, Fulai
Affiliation1.Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Fang, Xiang-Er,Guo, Fulai,Yuan, Ye-Fei. On the Cooling Flow Problem in the Gaseous Halo of the Milky Way[J]. ASTROPHYSICAL JOURNAL,2020,894(1):11.
APA Fang, Xiang-Er,Guo, Fulai,&Yuan, Ye-Fei.(2020).On the Cooling Flow Problem in the Gaseous Halo of the Milky Way.ASTROPHYSICAL JOURNAL,894(1),11.
MLA Fang, Xiang-Er,et al."On the Cooling Flow Problem in the Gaseous Halo of the Milky Way".ASTROPHYSICAL JOURNAL 894.1(2020):11.
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