The Index of Clumpiness of the Distribution of Images of Galaxies.
1954; Institute of Physics; Volume: 1; Linguagem: Inglês
10.1086/190008
ISSN1538-4365
AutoresJerzy Neyman, Elizabeth L. Scott, C. D. Shane,
Tópico(s)Astronomical Observations and Instrumentation
Resumoview Abstract Citations (22) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Index of Clumpiness of the Distribution of Images of Galaxies. Neyman, Jerzy ; Scott, Elizabeth L. ; Shane, C. D. Abstract The subject of study is the index K of dumpiness of the distribution of images of galaxies on a photographic plate. Its definition, referring to counts of galaxies in areas w on the photographic plate, is suggested by that of a related characteristic k(z, n) studied by Zwicky. With reference to the recent theory of the distribution of galaxies in space, the dependence of K upon the physical characteristics of this distribution (the frequency of clusters, the variation in the number of galaxies per cluster, the compactness of clusters) and upon observational factors (size and shape of regions c in which counts are made and limiting apparent magnitude of plate) is studied. The theoretical conclusions regarding the dependence of K on the size and shape of are found to contradict the conclusions implied by an alternative theory of Chandraselthar-Miinch-Limber. Empirical values of K obtained from counts of images of galaxies on Lick Observatory plates appear to agree with the theory of the authors. Also the same empirical values of K appear to agree qualitatively with those found by Zwicky. However, at least within the range of limiting magnitudes investigated, in order to explain the shape of the empirical curves, there is no necessity for the hypothesis of extragalactic absorbing clouds. Publication: The Astrophysical Journal Supplement Series Pub Date: December 1954 DOI: 10.1086/190008 Bibcode: 1954ApJS....1..269N full text sources ADS |
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