Constraints on galaxy bias, matter density, and primordial non-Gaussianity from the PSCz galaxy redshift survey
Feldman, Hume A.
Frieman, J. A.
Fry, J. N.
AMERICAN PHYSICAL SOC
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We compute the bispectrum fur 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(-0.19)(+0.18) and b(2)/b(1)(2) = -0.42 +/- 0.19, with no sign of scale-dependent bias for k less than or equal to 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 B-3 < 0.35.
Feldman, HA; Frieman, JA; Fry, JN; Scoccimarro, R. Constraints on galaxy bias, matter density, and primordial non-Gaussianity from the PSCz galaxy redshift survey. PHYSICAL REVIEW LETTERS. Feburary 2001. 86(8) : 1434-1437
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