PSCz-1.2 Jy Comparison: A Spherical Harmonics Approach

Details PSCz-1.2 Jy Comparison: A Spherical Harmonics Approach PSCz-1.2 Jy Comparison: A Spherical Harmonics Approach

1999-08-31

arxiv.org/abs/astro-ph/9908358v1

Astronomy and Astrophysics

Astrophysics

4 pages Latex, 2 figures. Cosmic Flows Workshop, Victoria, Canada, July 1999, ed. S. Courteau, M. Strauss & J. Willick, ASP se

Scientific paper

We perform a detailed comparison of the IRAS PSCz and 1.2-Jy spherical harmonic coefficients of the density and velocity fields in redshift space. The monopole terms predicted from the two surveys show some differences. The mismatch between the velocity monopoles arises from faint sources and disappears when extracting a PSCz subsample of galaxies with fluxes larger than 1.2 Jy. The analysis of PSCz dipole moments confirms the same inconsistencies found by Davis, Nusser and Willick (1996) between the IRAS 1.2-Jy gravity field and MARK III peculiar velocities. We conclude that shot-noise, which is greatly reduced in our PSCz gravity field, cannot be responsible for the observed mismatch.

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