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Phys. Rev. Lett. 86, 1434–1437 (2001)

Constraints on Galaxy Bias, Matter Density, and Primordial Non-Gaussianity from the PSCz Galaxy Redshift Survey

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Hume A. Feldman1,*, Joshua A. Frieman2,3,†, J. N. Fry4,‡, and Román Scoccimarro5,§
1Department of Physics & Astronomy, University of Kansas, Lawrence, Kansas 66045
2NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510
3Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637
4Department of Physics, University of Florida, Gainesville, Florida 32611-8440
5Institute for Advanced Study, School of Natural Sciences, Einstein Drive, Princeton, New Jersey 08540

Received 5 October 2000; published in the issue dated 19 February 2001

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/b1 = 1.20-0.19+0.18 and b2/b12 = -0.42±0.19, with no sign of scale-dependent bias for k≤0.3hMpc-1. These results impose stringent constraints on non-Gaussian initial conditions. For dimensional scaling models with χN2 statistics, we find N>49, which implies a constraint on primordial skewness B3<0.35.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.1434
DOI:
10.1103/PhysRevLett.86.1434
PACS:
98.80.Es, 98.62.Py, 98.65.Dx

*Email address: feldman@ukans.edu

†Email address: frieman@fnal.gov

‡Email address: fry@phys.ufl.edu

§Email address: scoccima@ias.edu

 
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