Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415..450l&link_type=abstract
Astrophysical Journal v.415, p.450
Astronomy and Astrophysics
Astronomy
6
Cosmology: Large-Scale Structure Of Universe, Galaxies: Clustering, Methods: Statistical
Scientific paper
In a recent paper, Broadhurst et al. presented galaxy counts as a function of redshift in the direction of the north and south Galactic poles. Their results indicated a surprising amount of power on large scales and suggested a periodicity in the large-scale distribution of galaxies. Here we compute the one-dimensional power spectrum on large-scales projected from the known small-scale clustering of galaxies, including the effects of the coherent peculiar velocity due to gravity. We find that the external estimate of the mean power is rather uncertain. Our calculation shows the likelihood that the projected power as estimated internally from the data set can account for the high peak on large scales is less than 1%. This likelihood goes up by a factor of 15, if we restrict our internal power estimate to scales greater than 128 h-1 Mpc, indicating some extra power on very large scales. We also study the consequences of adding some intrinsic power on large scales. The periodicity in the pair counts may be consistent with extra power on those scales, but the sharply defined spike in the power spectrum remains unexplained, suggesting non-Gaussian statistics or some undiscovered statistical problem with the sample.
Luo Shan
Vishniac Ethan T.
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