Journal
ASTROPHYSICAL JOURNAL
Volume 695, Issue 2, Pages 1127-1131Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/695/2/1127
Keywords
large-scale structure of universe; X-rays: diffuse background
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Funding
- National Aeronautic and Space Administration
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The amount of detected baryons in the local universe is at least a factor of 2 smaller than that measured at high redshift. It is believed that a significant fraction of the baryons in the current universe is hiding in a hot filamentary structure filling the intergalactic space, the warm-hot intergalactic medium (WHIM). We found evidence of the missing baryons in the WHIM by detecting their signature on the angular correlation of diffuse X-ray emission with the XMM-Newton satellite. Our result indicates that 12% +/- 5% of the total diffuse X-ray emission in the energy range 0.4-0.6 keV is due to intergalactic filaments. The statistical significance of our detection is several sigmas (chi(2) > 136, N = 19). The error bar in the X-ray flux is dominated, instead, by cosmic variation and model uncertainties.
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