A study of the elongation of Abell clusters. I - A sample of 37 clusters studied earlier by Binggeli and Struble and Peebles

Details A study of the elongation of Abell clusters. I - A sample of 37 clusters studied earlier by Binggeli and Struble and Peebles A study of the elongation of Abell clusters. I - A sample of 37 clusters studied earlier by Binggeli and Struble and Peebles

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..217r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 217-227. Research supported by the Stichting Astron

Astronomy and Astrophysics

Astrophysics

69

Astrometry, Astronomical Spectroscopy, Galactic Clusters, Galactic Structure, Spectrum Analysis, Cosmology, Elliptical Galaxies, Elongation, Fourier Analysis, Galactic Evolution, Red Shift

Scientific paper

The authors present measurements of the elongation of the projected galaxy distributions in 37 Abell clusters, all with redshifts less than or equal to 0.1. The measurements are based on the brightest 100 galaxies in each cluster. These are found with a semiautomated procedure which selects the n brightest, clearly non-stellar objects on digitized images of Palomar Sky Survey plates of the cluster areas. The amplitude and position angle of the elongation signal are found by Fourier analysis of the azimuthal distribution of the cluster galaxies. The authors also determine the statistical uncertainties of these parameters. Comparison with earlier determinations of the elongation of these same clusters shows that the differences between independent position angle estimates increase with decreasing elongation amplitude. This explains most if not all of the previously reported apparent discrepancies between independent measurements.

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