NAOC Open IR  > 星系宇宙学研究部
Cross-correlation between the soft x-ray background and SZ Sky
Cheng, LM; Wu, XP; Cooray, A
AbstractWhile both X-ray emission and Sunyaev-Zel'dovich (SZ) temperature fluctuations are generated by the warm-hot gas in dark matter halos, the two observables have different dependence on the underlying physical properties, including the gas distribution. A cross-correlation between the soft X-ray background (SXRB) and the SZ sky may allow an additional probe on the distribution of warm-hot gas at intermediate angular scales and redshifts complementing studies involving clustering within SXRB and SZ separately. Using a halo approach, we investigate this cross-correlation analytically. The two contributions are correlated mildly with a correlation coefficient of similar to0.3, and this relatively low correlation presents a significant challenge for its detection. The correlation, at small angular scales, is affected by the presence of radiative cooling or preheating and provides a probe on the thermal history of the hot gas in dark halos. While the correlation remains undetectable with CMB data from the WMAP satellite and X-ray background data from existing catalogs, upcoming observations with CMB missions such as Planck, for the SZ side, and an improved X-ray map of the large scale structure, such as the one planned with DUET mission, may provide a first opportunity for a reliable detection of this cross-correlation.
KeywordCosmology : Theory Cosmology : Cosmic Microwave Background Galaxies : Intergalactic Medium Cosmology : Large-scale Structure Of Universe X-rays : Diffuse Background
Indexed BySCI
WOS IDWOS:000187356300007
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
3.CALTECH, Pasadena, CA 91125 USA
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GB/T 7714
Cheng, LM,Wu, XP,Cooray, A. Cross-correlation between the soft x-ray background and SZ Sky[J]. ASTRONOMY & ASTROPHYSICS,2004,413(1):65-71.
APA Cheng, LM,Wu, XP,&Cooray, A.(2004).Cross-correlation between the soft x-ray background and SZ Sky.ASTRONOMY & ASTROPHYSICS,413(1),65-71.
MLA Cheng, LM,et al."Cross-correlation between the soft x-ray background and SZ Sky".ASTRONOMY & ASTROPHYSICS 413.1(2004):65-71.
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