On the universality of the two-point galaxy correlation function

Astronomy and Astrophysics – Astronomy

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Galactic Clusters, Red Shift, Astronomical Catalogs, Correlation, Flux Density, Infrared Astronomy Satellite, Luminosity, Southern Sky

Scientific paper

The authors examine the behavior of the two-point galaxy correlation function ξ(r) in volume-limited subsamples of three complete redshift surveys: the CfA survey of northern galaxies with mB < 14.5, the diameter-limited Southern Sky survey and a full-sky 60 μm flux-limited survey of galaxies detected by the IRAS satellite. The correlation length r0 is found to scale approximately as the square root of the distance limit in both the CfA and Southern Sky catalogs, but is independent of the distance limit in the IRAS sample. The authors show that this effect is caused by a combination of factors: large positive density fluctuations in the foreground of the optically selected catalogs bias the estimate of r0 downward, while the brightest galaxies do appear to be more strongly clustered than the mean. The authors suggest r0 ≅ 5 h-1Mpc as a best estimate for the correlation length of optically selected L* galaxies.

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