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A Mean Density of 112 M-circle dot pc(-3) for Central Molecular Zone Clumps-Evidences for Shear-enabled Pressure Equilibrium in the Galactic Center
Li, Guang-Xing1; Zhang, Chuan-Peng2,3
2020-07-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume897Issue:1Pages:8
AbstractWe carry out a systematic study of the density structure of gas in the Central Molecular Zone (CMZ) in the Galactic center by extracting clumps from the APEX Telescope Large Area Survey of the Galaxy survey at 870 mu m. We find that the clumps follow a scaling of m = rho(0)r(3), which corresponds to a characteristic density of n(H2) = 1.6 x 10(3) cm(-3) (rho(0) = 112 M-circle dot pc(-3)) with a variation of approximate to 0.5 dex, where we assumed a gas-to-dust mass ratio of 100. This characteristic density can be interpreted as the result of thermal pressure equilibrium between the molecular gas and the warm ambient interstellar medium. Such an equilibrium can plausibly be established since shear has approximately the same strength as self-gravity. Our findings may explain the fact that star formation in the CMZ is highly inefficient compared to the rest of the Milky Way disk. We also identify a population of clumps whose densities are two orders of magnitudes higher in the vicinity of the Sgr B2 region, which we propose are produced by collisions between the clumps of lower densities. For these collisions to occur, processes such as compressive tides probably have created the appropriate condition by assembling the clumps together.
KeywordGalactic center Interstellar medium Star formation Tidal interaction Gravitational collapse
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.3847/1538-4357/ab8c47
WOS KeywordSTAR-FORMATION ; INTERSTELLAR-MEDIUM ; GRAVITATIONAL-INSTABILITY ; CLOUDS ; GAS ; GALAXY ; KINEMATICS ; TURBULENCE ; EVOLUTION ; EMISSION
Language英语
Funding ProjectNational Natural Science Foundation of China[11703040]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000549173300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82693
Collection中国科学院国家天文台
Corresponding AuthorLi, Guang-Xing
Affiliation1.Yunnan Univ, South Western Inst Astron Res, Kunming 650500, Yunnan, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
3.Chinese Acad Sci, CAS Key Lab FAST, Natl Astron Observ, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Li, Guang-Xing,Zhang, Chuan-Peng. A Mean Density of 112 M-circle dot pc(-3) for Central Molecular Zone Clumps-Evidences for Shear-enabled Pressure Equilibrium in the Galactic Center[J]. ASTROPHYSICAL JOURNAL,2020,897(1):8.
APA Li, Guang-Xing,&Zhang, Chuan-Peng.(2020).A Mean Density of 112 M-circle dot pc(-3) for Central Molecular Zone Clumps-Evidences for Shear-enabled Pressure Equilibrium in the Galactic Center.ASTROPHYSICAL JOURNAL,897(1),8.
MLA Li, Guang-Xing,et al."A Mean Density of 112 M-circle dot pc(-3) for Central Molecular Zone Clumps-Evidences for Shear-enabled Pressure Equilibrium in the Galactic Center".ASTROPHYSICAL JOURNAL 897.1(2020):8.
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