Galaxy correlations on large scales

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmology, Galaxies, Sky Surveys (Astronomy), Universe, Angular Distribution, Astronomical Catalogs, Correlation, Dark Matter, Perturbation Theory

Scientific paper

First results are presented on large-scale structure in the universe from a uniform survey of more than about 2 million galaxies brighter that b(j) = 20.5 constructed from machine scans of 185 UK Schmidt plates. Over a range of three magnitudes, the galaxy two-point angular correlation function, w(theta), scales with depth as expected if real clustering in the galaxy distribution is being measured; the correlation functions show a break from a power law at roughly the same physical separation as found by Groth and Peebles (1977) from their analysis of the Lick catalog, but the present measurements decline much more gently from a power law on larger scales. Groth and Peebles may have removed some intrinsic clustering when they corrected for large-scale gradients in the Lick counts. This analysis has important implications for theories of the formation of large-scale structure. In particular, more large-scale clustering than predicted by popular versions of the Cold Dark Matter cosmogony is implied.

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