Evidence for the Missing Baryons in the Angular Correlation of the Diffuse X-ray Background

Abstract

The amount of detected baryons in the local Universe is at least a factor of two smaller than 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 $(12\pm 5)$% 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.

15 pages, 3 figures, Accepted for publication on ApJ

References in corpus (8)

• Where Are the Baryons? II: Feedback Effects
• Detection of hot gas in the filament connecting the clusters of galaxies Abell 222 and Abell 223
• The O VII X-ray forest toward Markarian 421: Consistency between XMM-Newton and Chandra
• On the Putative Detection of z>0 X-ray Absorption Features in the Spectrum of Markarian 421
• Xmm-Newton Observations of the Diffuse X-ray Background
• The XMM Large Scale Structure Survey: Properties and Two-Point Angular Correlations of Point-like Sources
• X-Ray Emission from the Warm Hot Intergalactic Medium
• XMM-Newton View of the z>0 Warm-Hot Intergalactic Medium Toward Markarian 421

Cited by in corpus (27)

• A Weak-Lensing Mass Reconstruction of the Large-Scale Filament Feeding the Massive Galaxy Cluster MACSJ0717.5+3745
• Detection of warm and diffuse baryons in large scale structure from the cross-correlation of gravitational lensing and the thermal Sunyaev-Zeldovich effect
• Properties of the cosmological filament between two clusters: A possible detection of a large-scale accretion shock by $Suzaku$
• The nature of the unresolved extragalactic soft CXB
• Growing a `Cosmic Beast': Observations and Simulations of MACS J0717.5+3745
• Properties of the Diffuse X-ray Background toward MBM20 with Suzaku
• Super-virial temperature or Neon overabundance?: Suzaku observations of the Milky Way circumgalactic Medium
• The effect of feedback on the emission properties of the Warm-Hot Intergalactic Medium
• Wide-Field Optical Spectroscopy of Abell 133: A Search for Filaments Reported in X-ray Observations
• Search for X-Ray Emission Associated with the Shapley Supercluster with Suzaku
• Studying the Warm-Hot Intergalactic Medium in Emission
• In-orbit background of X-ray microcalorimeters and its effects on observations
• Effect of the Metallicity on the X-ray Emission from the Warm-Hot Intergalactic Medium
• Multi-wavelength mock observations of the WHIM in a simulated galaxy cluster
• Discovery of a large-scale galaxy filament near a candidate intergalactic X-ray absorption system
• Study of the Intracluster and Intergalactic Medium in the Sculptor Supercluster with Suzaku
• Temperature and Entropy Profiles to the Virial Radius of Abell 1246 Cluster Observed with Suzaku
• DXL: a sounding rocket mission for the study of solar wind charge exchange and local hot bubble X-ray emission
• Expected properties of the Two-Point Autocorrelation Function of the IGM
• Modeling X-ray Emission Around Galaxies
• Contribution of Unresolved Point Sources to the Diffuse X-ray Background below 1 keV
• X-ray and Sunyaev-Zeldovich properties of the WHIM
• Studying the Warm Hot Intergalactic Medium in emission: a reprise
• Studying the ICM in clusters of galaxies via surface brightness fluctuations of the cosmic X-ray background
• Contemporaneous XMM-Newton investigation of a giant X-ray flare and quiescent state from a cool M-class dwarf in the local cavity
• Point source contribution to the Diffuse X-ray Background below 1 keV and its effect on our understanding of the circum-galactic medium
• Spatial Power Spectral Analysis of the Suzaku X-ray Background