期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 8, 页码 1434-1437出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.1434
关键词
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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.
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