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- W1533441374 abstract "We present a full description of the N-probability density function of the galaxy number density fluctuations. This N-pdf is given in terms, on the one hand, of the cold dark matter correlations and, on the other hand, of the galaxy bias parameter. The method relies on the assumption commonly adopted that the dark matter density fluctuations follow a local non-linear transformation of the initial energy density perturbations. The N-pdf of the galaxy number density fluctuations allows for an optimal estimation of the bias parameter (e.g., via maximum-likelihood estimation, or Bayesian inference if there exists any emph{a priori} information on the bias parameter). It also provides the proper framework to perform model selection between two competitive hypotheses (e.g., galaxy biasing versus a one-to-one relation between the galaxy number density and the dark matter perturbations). The bias estimation capabilities of the N-pdf are proved by SDSS-like simulations, showing that our estimator is unbiased. We apply our formalism to the 7th release of the SDSS main sample (for a volume-limited subset with absolute magnitudes $M_r leq -20$). We obtain a maximum-likelihood bias estimate $hat{b} = 1.500 pm 0.036$, for galaxy number density fluctuations in cells of the size of $30h^{-1}$Mpc. Different model selection criteria show that galaxy biasing is clearly favoured." @default.
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- W1533441374 date "2015-06-25" @default.
- W1533441374 modified "2023-09-27" @default.
- W1533441374 title "Galaxy bias determination through the N-pdf of the galaxy number density" @default.
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