A Caltech Library Service

On the Physical Characteristics of the Perseus Cluster of Nebulae

Zwicky, F. (1942) On the Physical Characteristics of the Perseus Cluster of Nebulae. Proceedings of the National Academy of Sciences of the United States of America, 28 (9). pp. 355-361. ISSN 0027-8424.

See Usage Policy.


Use this Persistent URL to link to this item:


The important question of the segregation of nebulae of different brightness can also only partly be solved until larger Schmidt telescopes are available. In addition, the velocity distribution as a function of the brightness of the nebulae must be investigated. The problems of the segregation of nebulae and of the dispersion in the velocities demand also further theoretical clarification since the classical statistical mechanics gives no answer to the fundamental questions which arise in connection with gravitational cooperative assemblies which are composed of such diverse elements as the nebulae, the stars and the constituents of intergalactic and interstellar matter. The uniformity of the structure of symmetrical clusters of nebulae observed so far and the quantitative agreement of their observed physical characteristics with those derived theoretically for the isothermal gravitational "gas" sphere suggest that the short-time scale associated customarily with the hypothesis of an expanding universe will perhaps become the less attractive the more the investigations on the large-scale distribution of matter in the universe progress.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:Copyright © 1942 by the National Academy of Sciences Communicated July 31, 1942
Issue or Number:9
Record Number:CaltechAUTHORS:ZWIpnas42a
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5685
Deposited By: Archive Administrator
Deposited On:27 Oct 2006
Last Modified:02 Oct 2019 23:25

Repository Staff Only: item control page