Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-31
Mon.Not.Roy.Astron.Soc.372:1333-1344,2006
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS, revised version matching the accepted one
Scientific paper
10.1111/j.1365-2966.2006.10941.x
We study the three-dimensional distribution of non virialised matter at z~2 using high resolution spectra of QSO pairs and simulated spectra drawn from cosmological hydrodynamical simulations. We have collected the largest sample of QSO pairs ever observed with UVES at the ESO-VLT, with angular separations between ~1 and 14 arcmin. The observed correlation functions of the transmitted flux in the HI Lyman alpha forest along and transverse to the lines of sight are in good agreement implying that the distortions in redshift space due to peculiar velocities are small. The clustering signal is significant up to velocity separations of ~200 km/s, or about 3 h^{-1} comoving Mpc. The regions at lower overdensity (rho/
Bianchi Simone
Boyle Brian
Cristiani Stefano
D'Odorico Valentina
Lopez Sebastian
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