Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.8404g&link_type=abstract
American Astronomical Society, AAS Meeting #211, #84.04; Bulletin of the American Astronomical Society, Vol. 39, p.875
Astronomy and Astrophysics
Astronomy
Scientific paper
Using data from XMM-Newton we found evidence of the presence of the missing baryons in the intergalactic medium looking at the signature of the Warm-Hot Intergalactic Medium on the angular correlation of the diffuse X-ray emission. Our results indicate that about (18±5)% of the diffuse X-ray emission in the energy range 0.4-0.6 keV is due to the emission from the intergalactic filaments, in agreement with results from hydrodynamic simulations and demonstrating that the missing baryons are, in fact, "hiding” in the filaments.
For the investigation we combined several observations available in the XMM-Newton public archive, including two "proprietary” observations specifically designed for this investigation. We used data from 11 observations, corresponding to 6 different targets. We used the angular Autocorrelation Function (AcF) to characterize the angular correlation of the diffuse emission. After carefully removing all contributions from known sources (including unresolved point sources and galactic emission, and instrumental background), we find a clear signature in the AcF at angular scales of 1-5 arcmin with a 4 sigma confidence level. The results are in good agreement with the X-ray emission expected from hydrodynamic simulations.In addition to showing and discussing the results, in this paper we will discuss our procedure to analyze the data, focusing on the removal of the contribution from all sources of contamination, as it is the most critical aspect of the investigation. The investigation was supported, in part, by NASA.
Galeazzi Massimiliano
Gupta Anupam
Ursino Eugenio
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