Evidence for the missing baryons in the angular correlation of the diffuse X-ray background

M. Galeazzi; A. Gupta; E. Ursino

doi:10.1088/0004-637X/695/2/1127

Evidence for the missing baryons in the angular correlation of the diffuse X-ray background

M. Galeazzi, A. Gupta, E. Ursino

Physics

Research output: Contribution to journal › Article

23 Scopus citations

Abstract

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 (χ² > 136, N = 19). The error bar in the X-ray flux is dominated, instead, by cosmic variation and model uncertainties.

Original language	English (US)
Pages (from-to)	1127-1131
Number of pages	5
Journal	Astrophysical Journal
Volume	695
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/695/2/1127
State	Published - Apr 20 2009

Keywords

Large-scale structure of universe
X-rays: diffuse background

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Galeazzi, M., Gupta, A., & Ursino, E. (2009). Evidence for the missing baryons in the angular correlation of the diffuse X-ray background. Astrophysical Journal, 695(2), 1127-1131. https://doi.org/10.1088/0004-637X/695/2/1127

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abstract = "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 (χ2 > 136, N = 19). The error bar in the X-ray flux is dominated, instead, by cosmic variation and model uncertainties.",

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