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Cross-correlation between the soft X-ray background and SZ Sky

Cheng, L.-M. and Wu, X.-P. and Cooray, A. (2004) Cross-correlation between the soft X-ray background and SZ Sky. Astronomy & Astrophysics, 413 (1). pp. 65-71. ISSN 0004-6361. doi:10.1051/0004-6361:20031534.

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While 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 ~0.3, 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.

Item Type:Article
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Cooray, A.0000-0002-3892-0190
Additional Information:© 2004 ESO. Received: 24 March 2003. Accepted: 30 September 2003. We gratefully acknowledge the valuable comments by an anonymous referee. This work was supported by the National Science Foundation of China, under Grant No. 10233040, and the Ministry of Science and Technology of China, under Grant No. NKBRSF G19990754.
Funding AgencyGrant Number
National Science Foundation of China10233040
Ministry of Science and Technology (China)NKBRSF G19990754
Subject Keywords:cosmology: theory - cosmology: cosmic microwave background - galaxies: intergalactic medium - cosmology: large-scale structure of universe - X-rays: diffuse background
Issue or Number:1
Record Number:CaltechAUTHORS:20180302-063752354
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Official Citation:Cross-correlation between the soft X-ray background and SZ Sky L.-M. Cheng, X.-P. Wu and A. Cooray A&A, 413 1 (2004) 65-71 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85048
Deposited By: Ruth Sustaita
Deposited On:02 Mar 2018 16:29
Last Modified:15 Nov 2021 20:25

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