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Cosmological Radiative Transfer andthe Line-of-Sight Proximity Effect

Published online by Cambridge University Press:  20 January 2011

H. Wozniak ,
G. Hensler ,
A. M. Partl ,
A. Dall’Aglio ,
V. Müller  and
G. Hensler
A. M. Partl
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
A. Dall’Aglio
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
V. Müller
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
G. Hensler
Affiliation:
Institute of Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
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Abstract

We study the proximity effect around high redshift quasars in dependence on the quasarredshift and environment using 3D continuum radiative transfer simulations. Snapshots ofdark matter only simulations at redshift 3, 4, and 4.9 are mapped to hydrogen densitiesand temperatures using an effective equation of state. The overionization zone around QSOswith luminositiesLνHI = 1031and1032   ergHz-1s-1is studied in a UV background field in radiation equilibrium. By analyzing syntheticspectra of lines of sight originating at the QSO, the proximity effect is studied. We findthat the quasar spectral energy distribution, diffusion and shadowing due to Lyman Limitsystems play a role in the signal. Density inhomogeneities around the QSO are responsiblefor a large scatter around the mean proximity effect seen in all simulated QSO spectra.This scatter is larger than the differences arising from varying quasar hostenvironments.

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