Journal
ASTROPHYSICAL JOURNAL
Volume 693, Issue 1, Pages 1000-1006Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/693/1/1000
Keywords
cosmic microwave background; large-scale structure of universe; X-rays: galaxies
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Funding
- National Science Foundation of China [10673008]
- Ministry of Education, China
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We present an observational search for the possible correlation between cosmic microwave background (CMB) polarization and soft X-ray background (SXRB) based on the ROSAT All-sky Survey (RASS) archive and WMAP five-year observations. This is motivated by the fact that some of the CMB polarization may arise from the scattering of CMB photons due to the free electrons generated by X-ray heating sources in the epoch of reionization. Detection of such a correlation allows one to study the role of X-ray heating in the process of reionization. However, the cross-angular power spectrum of the CMB polarization and SXRB maps constructed from ROSAT RASS and WMAP five-year maps is consistent with no correlation. We attribute this negative detection to both the extremely weak signals and large instrumental noises. While a future search is needed with high-sensitivity instruments for both CMB polarization and soft X-ray photons, our current results can still be used as a useful constraint on the effect of X-ray heating in the epoch of reionization.
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