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The number of galaxies belonging to the cluster, out to (at least) the virial radius. parent The parent structure (e.g. parent galaxy cluster, parent supercluster...) richness Abell (or related) richness class. Based on number of members within a magnitude range of m 3 to m 3 +2, where m 3 is the magnitude of the third brightest member of the ...
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Astronomers used the combined powers of the Hubble and Webb telescopes to take a portrait of colliding clusters of galaxies, called the Christmas Tree Galaxy Cluster.
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It consisted of two known rich clusters and one newly discovered cluster as a result of the study that discovered it. The then known clusters were Cl 1604+4304 (z=0.897) and Cl 1604+4321 (z=0.924), which then known to have 21 and 42 known galaxies respectively. The then newly discovered cluster was located at 16 h 04 m 25.7 s, +43° 14′ 44.7 ...
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies , star clusters and emission nebulae .