Correlation function constraints on large-scale structure in the distribution of galaxies

Details Correlation function constraints on large-scale structure in the distribution of galaxies Correlation function constraints on large-scale structure in the distribution of galaxies

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..650f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 4, Aug. 15, 1992, p. 650-658. Research support

Astronomy and Astrophysics

Astronomy

21

Angular Correlation, Astronomical Catalogs, Astronomical Photometry, Galactic Clusters, Cosmology, Position Errors, Sky Surveys (Astronomy), Universe

Scientific paper

The question of whether photometric errors may have produced the large-scale power in the APM galaxy correlation function is considered. Using the CCD galaxy sequences that are available on 39 of the 185 Schmidt fields of the APM survey, an analysis of variance is applied to make an independent estimate of the size of the zero-point errors associated with the APM galaxy photometry. The methods finds an rms dispersion for these errors of 0.084 mag, a factor of 2 larger than previously claimed. Evidence is presented to show that this error may also be spatially correlated over the large APM survey area and that the tests carried out by the APM/Oxford group could be insensitive to such large-scale effects. If it is confirmed that there are spatially correlated APM zero-point errors of this size, then removing the excess power caused by such errors from the measured APM correlation function would reduce the spatial break-scale for the galaxy correlation function to about 10/h Mpc, in better agreement with original estimate from the Lick catalog.

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