Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-27
Mon.Not.Roy.Astron.Soc.368:74-84,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 9 figures. Accepted for pubblication in MNRAS. Added 2 new sections and other minor changes due to referee report
Scientific paper
10.1111/j.1365-2966.2006.10102.x
We study the properties of the diffuse X-ray background by using the results of a cosmological hydrodynamical simulation of the concordance LambdaCDM model. The simulation follows gravitational and gas dynamics and includes a treatment of physical processes like radiative cooling, star formation and supernova feedback. From the simulation outputs, we produce a set of two-dimensional maps of the intergalactic medium X-ray emission integrated over redshift. We find that the signal in the soft (0.5-2 keV) band is lognormally distributed with a mean intensity of about 4 10^-12 erg s^-1 cm^-2 deg^-2; approximately 40 per cent of the emission originates from warm-hot gas (defined as baryons with 10^5
Borgani Stefano
Cheng Ling-Mei
Diaferio Antonaldo
Dolag Klaus
Moscardini Lauro
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