Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....24..453f&link_type=abstract
(Astrofizika, vol. 24, May-June 1986, p. 453-465) Astrophysics (ISSN 0571-7132), vol. 24, no. 3, Nov. 1986, p. 258-265. Translat
Astronomy and Astrophysics
Astrophysics
Brightness Distribution, Density Distribution, Galactic Clusters, Spatial Distribution, Covariance, Interstellar Extinction, Latitude, Paradoxes, Red Shift
Scientific paper
Because of a supersensitivity effect considered in the first section of the present paper, rich clusters must almost all be situated in windows of the interstellar medium. It is for this reason that the color excesses of the brightest members weakly depend on the galactic latitude, while the number density of distant clusters observed in the vicinity of nearer ones is raised. A study is made of the distribution on the sky and in space of 702 rich clusters with z less than 0.2 and b of 40 deg or more. A mechanism is described for the first time by means of which nonuniform interstellar extinction leads to an overestimation of the covariance function on the transition to nearer clusters. The existence of this mechanism removes a decisive argument against a determining role of interstellar extinction and inhomogeneity of the data in cluster statistics.
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