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Autocorrelation function of the soft X-ray background produced by warm-hot gas in dark halos
Wu, XP; Xue, YJ
2003-06-10
发表期刊ASTROPHYSICAL JOURNAL
卷号590期号:1页码:8-14
摘要We calculate the angular two-point autocorrelation function (ACF) of the soft X-ray background (SXRB) produced by the warm-hot intergalactic medium (WHIM) associated with dark halos, motivated primarily by searching for missing baryons and distinguishing different physical processes of the WHIM in dark halos. We employ a purely analytic model for the halo population that is completely determined by the universal density pro. le and the Press-Schechter mass function. We then adopt a phenomenological approach to nongravitational processes of the WHIM such as preheating and radiative cooling. It shows that the power spectra of the SXRB predicted by three WHIM models, namely, the self-similar model, preheating model, and cooling model, demonstrate remarkably different signatures in both amplitude and shape, with the peak locations moving from l approximate to 4 x 10(4) for the self-similar model to a smaller value of l approximate to (3-5) x 10(3) when nongravitational processes are taken into account. The corresponding ACFs for preheating and cooling models become shallower too as compared to the prediction of the self-similar model. This may permit an effective probe of the physical processes of the WHIM in massive halos in conjunction with the observationally determined power spectrum or ACF of the SXRB from diffuse WHIM. However, a direct comparison of our theoretical predictions with existing data (e.g., the ACF determined from ROSAT observations) is still difficult because of the dominant contribution of active galactic nuclei in the soft X-ray sky. We discuss briefly the implications of our results for resolving the missing baryon problem in the local universe.
关键词Cosmology : Theory Intergalactic Medium X-rays : Diffuse Background
收录类别SCI
语种英语
WOS记录号WOS:000183278700002
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8490
专题星系宇宙学研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Wu, XP,Xue, YJ. Autocorrelation function of the soft X-ray background produced by warm-hot gas in dark halos[J]. ASTROPHYSICAL JOURNAL,2003,590(1):8-14.
APA Wu, XP,&Xue, YJ.(2003).Autocorrelation function of the soft X-ray background produced by warm-hot gas in dark halos.ASTROPHYSICAL JOURNAL,590(1),8-14.
MLA Wu, XP,et al."Autocorrelation function of the soft X-ray background produced by warm-hot gas in dark halos".ASTROPHYSICAL JOURNAL 590.1(2003):8-14.
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