The Shane-Wirtanen counts - Observer and time-dependent effects

Details The Shane-Wirtanen counts - Observer and time-dependent effects The Shane-Wirtanen counts - Observer and time-dependent effects

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..507g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 507-517.

Statistics

Computation

30

Astronomical Catalogs, Astronomical Photometry, Cosmology, Galactic Clusters, Computational Astrophysics, Cross Correlation, Probability Density Functions, Time Dependence, Weighting Functions

Scientific paper

In a recent paper, de Lapparent, Kurtz, and Geller (1986) announce the discovery of possible observer and time-dependent effects in the counts of galaxies in the Lick catalog and suggest that these effects may have distorted the galaxy correlation function calculated by Groth and Peebles (1986) from the Lick counts. In particular, they suggest that these effects may have introduced a break where none exists or may have diluted a break stronger than that seen by Groth and Peebles. The Lick counts have been reexamined and it is found that the observer and time-dependent effects are marginal and that they can have had only a negligible effect on the estimates of the correlation functions. Correlation functions have been calculated for each observer and time period separately and it is found that they all depart from the small-angle power law at about the expected scale. Further, the average of these correlation functions agrees extremely well with the average correlation function published by Groth and Peebles.

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