Constraints on galaxy bias, matter density, and primordial non-Gaussianity from the PSCz galaxy redshift survey.
Phys Rev Lett
; 86(8): 1434-7, 2001 Feb 19.
Article
em En
| MEDLINE
| ID: mdl-11290161
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.
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Base de dados:
MEDLINE
Assunto principal:
Sistema Solar
/
Gravitação
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article