Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-28
Astronomy and Astrophysics
Astrophysics
20 pages, 18 figures, accepted for publication in MNRAS
Scientific paper
We investigate how well the 3D density field of neutral hydrogen in the Intergalactic Medium (IGM) can be reconstructed using the Lyman-alpha absorptions observed along lines of sight to quasars separated by arcmin distances in projection on the sky. We use cosmological hydrodynamical simulations to compare the topologies of different fields: dark matter, gas and neutral hydrogen optical depth and to investigate how well the topology of the IGM can be recovered from the Wiener interpolation method implemented by Pichon et al. (2001). The global statistical and topological properties of the recovered field are analyzed quantitatively through the power-spectrum, the probability distribution function (PDF), the Euler characteristics, its associated critical point counts and the filling factor of underdense regions. The local geometrical properties of the field are analysed using the local skeleton by defining the concept of inter-skeleton distance. At scales larger than ~1.4
Caucci Sara
Colombi Stephane
Petitjean Patrick
Pichon Christophe
Rollinde Emmanuel
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