title: Constraints on galaxy bias, matter density, and primordial non-Gaussianity from the PSCz galaxy redshift survey.
abstract: We compute the bispectrum for the IRAS PSCz catalog and find that the galaxy distribution displays the characteristic signature of gravity. Assuming Gaussian initial conditions, we obtain galaxy biasing parameters 1/b(1) = 1.20(+0.18)(-0.19) and b(2)/b(2)(1) = -0.42+/-0.19, with no sign of scale-dependent bias for k < or = 0.3h Mpc(-1). These results impose stringent constraints on non-Gaussian initial conditions. For dimensional scaling models with chi(2)(N) statistics, we find N > 49, which implies a constraint on primordial skewness B3 < 0.35.
authors: Department of Physics & Astronomy, University of Kansas, Lawrence 66045, USA. feldman@ukans.edu
authors: H A
authors: HA
authors: Feldman
authors: J A
authors: JA
authors: Frieman
authors: J N
authors: JN
authors: Fry
authors: R
authors: R
authors: Scoccimarro
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D006112:Gravitation; D016011:Normal Distribution; D016082:Solar System