Journal Article

A consistent comparison of bias models using observational data

A. Papageorgiou, M. Plionis, S. Basilakos and C. Ragone-Figueroa

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 1, pages 106-116
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20559.x
A consistent comparison of bias models using observational data

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We investigate five different models for the dark matter (DM) halo bias, that is, the ratio of the fluctuations of mass tracers to those of the underlying mass, by comparing their cosmological evolution using optical quasar (QSO) and galaxy bias data at different redshifts, consistently scaled to the WMAP7 cosmology. Under the assumption that each halo hosts one extragalactic mass tracer, we use a χ2-minimization procedure to determine the free parameters of the bias models as well as to statistically quantify their ability to represent the observational data. Using the Akaike information criterion we find that the model that represents best the observational data is the Basilakos & Plionis model with the tracer merger extension. The only other statistically equivalent model, as indicated by the same criterion, is the Tinker et al. model. Finally, we find an average, over the different models, DM halo mass that hosts optical QSOs of Mh≃ 2.7(±0.6) × 1012h−1 M, while the corresponding value for optical galaxies is Mh≃ 6.3(±2.1) × 1011h−1 M.

Keywords: galaxies: haloes; quasars: general; cosmology: theory; large-scale structure of Universe

Journal Article.  8206 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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