NAOC Open IR  > 星系宇宙学研究部
Autocorrelation function of the soft X-ray background produced by warm-hot gas in dark halos
Wu, XP; Xue, YJ
2003-06-10
Source PublicationASTROPHYSICAL JOURNAL
Volume590Issue:1Pages:8-14
AbstractWe 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.
KeywordCosmology : Theory Intergalactic Medium X-rays : Diffuse Background
Indexed BySCI
Language英语
WOS IDWOS:000183278700002
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8490
Collection星系宇宙学研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wu, XP]'s Articles
[Xue, YJ]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wu, XP]'s Articles
[Xue, YJ]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wu, XP]'s Articles
[Xue, YJ]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.