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Cosmological Radiative Transfer and the 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 quasar redshift and environment using 3D continuum radiative transfer simulations. Snapshots of dark matter only simulations at redshift 3, 4, and 4.9 are mapped to hydrogen densities and temperatures using an effective equation of state. The overionization zone around QSOs with luminosities LνHI = 1031and1032   ergHz-1s-1 is studied in a UV background field in radiation equilibrium. By analyzing synthetic spectra of lines of sight originating at the QSO, the proximity effect is studied. We find that the quasar spectral energy distribution, diffusion and shadowing due to Lyman Limit systems play a role in the signal. Density inhomogeneities around the QSO are responsible for 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 host environments.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 44: JENAM 2008: Grand Challenges in Computational Astrophysics , 2010 , pp. 45 - 48
Copyright
© EAS, EDP Sciences 2011

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