Richness - A measure of the number of galaxies in a cluster. The more galaxies there are, the greater the richness ...
The richness and diversity of the Solnhofen limestone
Solnhofen limestone ...
Information richness or a map that is multivariate shows relationships within the map. Showing several variables allows comparison, which adds to the meaningfulness of the map.
Clusters have a wide range of richness, size, and internal structure in the distribution of galaxies. It is hard to draw a line between groups and clusters. We are located in a rather distinct subgroup on the outskirts of the Virgo Cluster, viz.
As a consequence, for most astronomers the working definition of a globular cluster now concentrates more on the age of a cluster than on its richness, and a few are quite sparse. About 140 of these clusters are now known in our Milky Way galaxy.
It has the gorgeous clarity and richness of a certain mid-sixties b/w film stock; that high-contrast black-and-white reminiscent for me of films as diverse as Before The Revolution, The Servant and Faster Pussycat! Kill! Kill!.
A diffuse, irregular cluster of about 500 galaxies (z = 0.0183) (richness class 2) dominated by and centered on the Seyfert galaxy NGC 1275 (Perseus A). Mass required to bind the cluster, greater than 1015 M; mass of cluster, about 2 × 1015 M. [H76] ...
Abell classified such clusters as regular and irregular, and ranked them on six-point scales according to both their richness (population density) and distance (1 to 6, for closest to furthest).
"The research field of supernovae is exploding right now, if you'll pardon the pun," adds Filippenko. "Many supernovae with peculiar new properties have been found, pointing to a greater richness in the physical mechanisms by which nature chooses to ...
These studies have also shown that the fraction of blue galaxies in clusters depends on the cluster type or richness (i.e. how many galaxies the cluster contains), ...
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 See also: Time, Light, Population, Second, Field
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