The faint galaxy correlation or lack thereof

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmology: Observations, Cosmology: Theory, Galaxies: Clustering, Methods: Statistical

Scientific paper

Measurements of the two-point angular autocorrelation function of galaxies down to median magnitudes of V =~24.5 from observations of a field containing Tyson & Seitzer's (1988) SGP field are described. While the uncertainties are large, these measurements suggest that the amplitude of the angular correlation function continues to decrease with decreasing median magnitude as has been observed for brighter samples. The measurements do not confirm Neuschaefer et al. 's (1991) amplitudes which increase for magnitudes fainter than V=~24.5. They are consistent within the calculated uncertainties with Efstathiou et al. 's (1991) result, but within the calculated uncertainties they are also consistent with a totally uncorrelated distribution. However, if the uncertainties are assumed to have been greatly overestimated, then the values of the amplitude would be significantly lower than Efstathiou et al. 's, and these measurements would then indicate that clustering growth is faster than what it would be if clustering was fixed in proper coordinates. This would be consistent with both N-body model predictions (Melott 1992; Yoshii et al. 1993) and an observational measurement of the growth rate of the spatial correlation function (Warren et al. 1993).

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