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SHOCK-ENHANCED C+ EMISSION AND THE DETECTION OF H2O FROM THE STEPHAN'S QUINTET GROUP-WIDE SHOCK USING HERSCHEL
Zhu, Weishan ; Feng, Long-long ; Xia, Yinhua ; Shu, Chi-Wang ; Gu, Qiusheng ; Fang, Li-Zhi
2013
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume777Issue:1Pages:66(16PP)
Corresponding AuthorZhu, WS (通讯作者) Nanjing Univ, Sch Astron & Space Sci, Nanjing 210092, Jiangsu, Peoples R China
AbstractWe use a suite of cosmological hydrodynamical simulations, run by two fixed grid codes, to investigate the properties of solenoidal and dilatational motions of the intergalactic medium (IGM) and the impact of numerical viscosity on turbulence in an Lambda CDM universe. The codes differ only in the spatial difference discretization. We find that (1) The vortical motion grows rapidly since z = 2 and reaches similar to 10 km s(-1)-90 km s(-1) at z = 0. Meanwhile, the small-scale compressive ratio r(CS) drops from 0.84 to 0.47, indicating comparable vortical and compressive motions at z = 0. (2) Power spectra of the solenoidal velocity possess two regimes, proportional to k(-0.89) and proportional to k(-2.02), while the total and dilatational velocity follow the scaling k(-1.88) and k(-2.20), respectively, in the turbulent range. The IGM turbulence may contain two distinct phases, the supersonic and post-supersonic phases. (3) The non-thermal pressure support, measured by the vortical kinetic energy, is comparable with the thermal pressure for rho(b) similar or equal to 10-100, or T < 10(5.5) Kat z = 0.0. The deviation of the baryon fraction from the cosmic mean shows a preliminary positive correlation with the turbulence pressure support. (4) A relatively higher numerical viscosity would dissipate both the compressive and vortical motions of the IGM into thermal energy more effectively, resulting in less developed vorticity, remarkably shortened inertial range, and leading to a non-negligible uncertainty in the thermal history of gas accretion. Shocks in regions outside of clusters are significantly suppressed by numerical viscosity since z = 2, which may directly cause the different levels of turbulence between the two codes.
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9920
Collection南极天文中心
Recommended Citation
GB/T 7714
Zhu, Weishan,Feng, Long-long,Xia, Yinhua,et al. SHOCK-ENHANCED C+ EMISSION AND THE DETECTION OF H2O FROM THE STEPHAN'S QUINTET GROUP-WIDE SHOCK USING HERSCHEL[J]. ASTROPHYSICAL JOURNAL,2013,777(1):66(16PP).
APA Zhu, Weishan,Feng, Long-long,Xia, Yinhua,Shu, Chi-Wang,Gu, Qiusheng,&Fang, Li-Zhi.(2013).SHOCK-ENHANCED C+ EMISSION AND THE DETECTION OF H2O FROM THE STEPHAN'S QUINTET GROUP-WIDE SHOCK USING HERSCHEL.ASTROPHYSICAL JOURNAL,777(1),66(16PP).
MLA Zhu, Weishan,et al."SHOCK-ENHANCED C+ EMISSION AND THE DETECTION OF H2O FROM THE STEPHAN'S QUINTET GROUP-WIDE SHOCK USING HERSCHEL".ASTROPHYSICAL JOURNAL 777.1(2013):66(16PP).
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