The Shane-Wirtanen counts - Systematics and two-point correlation function

Details The Shane-Wirtanen counts - Systematics and two-point correlation function The Shane-Wirtanen counts - Systematics and two-point correlation function

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...304..585d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 304, May 15, 1986, p. 585-598. Research supported by the Smithsonian Instit

Astronomy and Astrophysics

Astrophysics

46

Astronomical Catalogs, Correlation, Error Analysis, Galactic Clusters, Data Processing, Time Dependence

Scientific paper

Residual errors in the Selder et al. (SSGP) map which caused a break in both the correlation factor (CF) and the filamentary appearance of the Shane-Wirtanen map are examined. These errors, causing a residual rms fluctuation of 11 percent in the SSGP-corrected counts and a systematic rms offset of 8 percent in the mean count per plate, can be attributed to counting pattern and plate vignetting. Techniques for CF reconstruction in catalogs affected by plate-related systematic biases are examined, and it is concluded that accurate restoration may not be possible. Surveys designed to measure the CF at the depth of the SW counts on a scale of 2.5 deg, must have systematic errors of less than or about 0.04 mag.

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