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The temperature of IGM at high redshifts: shock heating and high mach problem
Jia, Jun-Yi1,2; Zhu, Wei-Shan3; Gao, Liang1,2,4; Feng, Long-Long3,5
2020-06-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume20Issue:6Pages:12
AbstractThe thermal history of cosmic gas in the dark ages remains largely unknown. It is important to quantify the impact of relevant physics on the IGM temperature between z = 10 and z similar to 30, in order to interpret recent and oncoming observations, including results reported by EDGES. We revisit the gas heating due to structure formation shocks in this era, using a set of fixed grid cosmological hydrodynamical simulations performed by three different codes. In all our simulations, the cosmic gas is predicted to be in multiphase state since z > 30. The gas surrounding high density peaks gradually develops a relation more sharp than T proportional to rho(2/3), approximately T proportional to rho(2), from z = 30 to z = 11, might be due to shock heating. Meanwhile, the gas in void region tends to have a large local Mach number, and their thermal state varies significantly from code to code. In the redshift range 11 - 20, the mass fraction of gas shock heated above the CMB temperature in our simulations is larger than previous semi-analytical results by a factor of 2 to 8. At z = 15, the fraction varies from similar to 19% to 52% among different codes. Between z = 11 and z = 20, the gas temperature < 1/T-K >(-1)(M) is predicted to be similar to 10 - 20 K by two codes, much higher than the adiabatic cooling model and some previous works. However, in our simulations performed by RAMSES, < 1/T-K >(-1)(M) is predicted to be even below the temperature required to explain result of the EDGES. Given the fact that different codes give different predictions, currently, it seems a challenge to make solid prediction on the temperature of gas at z similar to 17 in simulations.
Keywordcosmology: theory dark ages, reionization, first stars galaxies: high-redshift intergalactic medium
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China
DOI10.1088/1674-4527/20/6/95
WOS KeywordMISSING BARYONS ; SIMULATIONS ; DIFFERENCE ; EVOLUTION ; CODE
Language英语
Funding ProjectNational Key R&D Program of China[2017YFB0203300] ; Key Program of the National Natural Science Foundation of China (NFSC)[11733010] ; NSFC[11333008] ; NSFC[11673077] ; State Key Development Program for Basic Research of China[2015CB857000]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China ; National Key R&D Program of China ; National Key R&D Program of China ; Key Program of the National Natural Science Foundation of China (NFSC) ; Key Program of the National Natural Science Foundation of China (NFSC) ; NSFC ; NSFC ; State Key Development Program for Basic Research of China ; State Key Development Program for Basic Research of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000545667300001
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82755
Collection中国科学院国家天文台
Corresponding AuthorJia, Jun-Yi
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China
4.Univ Durham, Inst Computat Cosmol, Dept Phys, South Rd, Durham DH1 3LE, England
5.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Jia, Jun-Yi,Zhu, Wei-Shan,Gao, Liang,et al. The temperature of IGM at high redshifts: shock heating and high mach problem[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(6):12.
APA Jia, Jun-Yi,Zhu, Wei-Shan,Gao, Liang,&Feng, Long-Long.(2020).The temperature of IGM at high redshifts: shock heating and high mach problem.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(6),12.
MLA Jia, Jun-Yi,et al."The temperature of IGM at high redshifts: shock heating and high mach problem".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.6(2020):12.
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