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Constraining the Milky Way Mass with Its Hot Gaseous Halo
Guo, Fulai1,2; Zhang, Ruiyu1,2; Fang, Xiang-Er1
2020-12-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume904Issue:2Pages:6
AbstractWe propose a novel method to constrain the Milky Way (MW) mass M-vir with its corona temperature observations. For a given corona density profile, one can derive its temperature distribution assuming a generalized equilibrium model with nonthermal pressure support. While the derived temperature profile decreases substantially with radius, the X-ray-emission-weighted average temperature, which depends most sensitively on M-vir, is quite uniform toward different sight lines, consistent with X-ray observations. For a Navarro-Frenk-White (NFW) total matter distribution, the corona density profile should be cored, and we constrain M-vir = (1.19-2.95) x 10(12) M-circle dot. For a total matter distribution contributed by an NFW dark matter profile and central baryons, the corona density profile should be cuspy and M-vir,(dm) = (1.34-5.44) x 10(12)M(circle dot). Nonthermal pressure support leads to even higher values of Mvir, while a lower MW mass may be possible if the corona is accelerating outward. This method is independent of the total corona mass, its metallicity, and temperature at very large radii.
KeywordMilky Way mass X-ray astronomy Circumgalactic medium Hydrodynamics Galaxy dark matter halos the Milky Way Galaxy masses
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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences
DOI10.3847/2041-8213/abc749
WOS KeywordX-RAY ; GALAXY ; GAS ; CONTRACTION ; EMISSION
Language英语
Funding ProjectNational Natural Science Foundation of China[11873072] ; National Natural Science Foundation of China[11633006] ; Natural Science Foundation of Shanghai[18ZR1447100] ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences[QYZDBSSW-SYS033] ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier 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 through the Key Research Program of Frontier Sciences ; Chinese Academy of Sciences through the Key Research Program of Frontier Sciences
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000592071800001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81165
Collection中国科学院国家天文台
Corresponding AuthorGuo, Fulai
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Guo, Fulai,Zhang, Ruiyu,Fang, Xiang-Er. Constraining the Milky Way Mass with Its Hot Gaseous Halo[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,904(2):6.
APA Guo, Fulai,Zhang, Ruiyu,&Fang, Xiang-Er.(2020).Constraining the Milky Way Mass with Its Hot Gaseous Halo.ASTROPHYSICAL JOURNAL LETTERS,904(2),6.
MLA Guo, Fulai,et al."Constraining the Milky Way Mass with Its Hot Gaseous Halo".ASTROPHYSICAL JOURNAL LETTERS 904.2(2020):6.
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