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Evidence for substructure in rich clusters of galaxies from radial-velocity measurements
Abstract
We have used new radial-velocity measurements in 15 clusters of galaxies to look for substructure. With a new statistical test that looks for deviations of the local velocity mean and dispersion from the global values, we find that most of the clusters in our sample show significant subclustering. In 30%-40% of the cases, the subclusters contain a large fraction of the galaxies found in the main body of the cluster. This result is in good agreement with earlier work by Geller and Beers based on number counts. The large fraction of clusters with significant substructure, along with evidence based on radial- velocity dispersion profiles, suggest that many, perhaps most, rich clusters did not collapse in single, coherent events.
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Cited by
Mei, S., Blakeslee, J. P., Cote, P., Tonry, J. L., West, M. J., Ferrarese, L., Jordan, A., Peng, E. W., Anthony, A., & Merritt, D. (2007) · The Astrophysical Journal · doi:10.1086/509598 · Cited by 722
Combining Strong and Weak Gravitational Lensing in Abell 1689
Limousin, M., Richard, J., Jullo, E., Kneib, J., Fort, B., Soucail, G., Eliasdottir, A., Natarajan, P., Ellis, R. S., Smail, I., et al. (2007) · The Astrophysical Journal · doi:10.1086/521293 · Cited by 306
Revealing the Properties of Dark Matter in the Merging Cluster MACS J0025.4−1222
Bradač, M., Allen, S. W., Treu, T., Ebeling, H., Massey, R., Morris, R. G., von der Linden, A., & Applegate, D. (2008) · The Astrophysical Journal · doi:10.1086/591246 · Cited by 303
Menanteau, F., Hughes, J. P., Sifón, C., Hilton, M., González, J., Infante, L., Felipe Barrientos, L., Baker, A. J., Bond, J. R., Das, S., et al. (2012) · The Astrophysical Journal · doi:10.1088/0004-637x/748/1/7 · Cited by 183
Metadata
- Authors
- Dressler, A., & Shectman, S. A.
- Venue
- The Astronomical Journal
- Publisher
- American Astronomical Society
- Published
- 1988-04
- Volume
- 95
- Pages
- 985
- ISSN
- 0004-6256 (ISSN-L)
- OpenAlex
- W2059594277
- Cited by
- 500
- References
- 0
- FWCI
- 2.68
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Evidence for substructure in rich clusters of galaxies from radial-velocity measurements. https://app.cochat.ai/papers/10.1086/114694
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- Dressler, A., & Shectman, S. A. (1988). Evidence for substructure in rich clusters of galaxies from radial-velocity measurements. The Astronomical Journal. https://doi.org/10.1086/114694
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
