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Title:
The Shane-Wirtanen counts
Authors:
Geller, M. J.; de Lapparent, V.; Kurtz, M. J.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; École Normale Superieure de Jeunes Filles; Paris VII, Universite, Paris, France), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. L55-L58. (ApJL Homepage)
Publication Date:
12/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL MAPS, CORRELATION, COSMOLOGY, GALAXIES, CARTESIAN COORDINATES, GALACTIC CLUSTERS, IMAGE PROCESSING
DOI:
10.1086/184397
Bibliographic Code:
1984ApJ...287L..55G

Abstract

It is shown that the 2.5 degree-break in the galaxy correlation function derived from the Shane-Wirtanen star counts is indistinguishable from an artifact introduced by residual systematic variations in the effective magnitude limit from plate to plate. In order to avoid the introduction of a break, the maximum error from plate to plate must be no more than about 0.05 mag. Other large scale features in the data which are also affected by the systematic variations are discussed.

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