98.65.-r Galaxy groups, clusters, and superclusters; large scale structure of the Universe
- 98.65.At Interacting galaxies; galaxy pairs, and triples
- 98.65.Bv Small and compact galaxy groups
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98.65.Cw Galaxy clusters
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- 98.65.Dx Superclusters; large-scale structure of the Universe (including voids, pancakes, great wall, etc.)
- 98.65.Fz Galaxy mergers, collisions, and tidal interactions
- 98.65.Hb Intracluster matter; cooling flows