The Halo Mass-Bias Redshift Evolution in the ΛCDM Cosmology

We derive an analytic model for the redshift evolution of linear bias, allowing for interactions and merging of the mass tracers, by solving a second-order differential equation based on linear perturbation theory and the Friedmann-Lemaitre solutions of the cosmological field equations. We then stud...

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Bibliographic Details
Published in:The Astrophysical journal 2008-05, Vol.678 (2), p.627-634
Main Authors: Basilakos, S, Plionis, M, Ragone-Figueroa, C
Format: Article
Language:English
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Summary:We derive an analytic model for the redshift evolution of linear bias, allowing for interactions and merging of the mass tracers, by solving a second-order differential equation based on linear perturbation theory and the Friedmann-Lemaitre solutions of the cosmological field equations. We then study the halo-mass dependence of the bias evolution, using the dark matter halo distribution in a Lambda CDM simulation in order to calibrate the free parameters of the model. Finally, we compare our theoretical predictions with available observational data and find a good agreement. In particular, we find that the bias of optical QSO's evolve differently than those selected in X-rays and that their corresponding typical dark matter halo mass is [image] and [image], respectively.
ISSN:0004-637X
1538-4357
DOI:10.1086/586725