The Dynamics of the Merging Galaxy Cluster System A2256: Evidence for a New Subcluster
We present 236 new radial velocities of galaxies in the cluster A2256 measured with the WIYN Hydra multi-object spectrograph. Combined with the previous work of Fabricant, Kent, and Kurtz (1989), we have velocities for a total of 319 galaxies of which 277 are cluster members. In addition to the new...
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Main Authors | , , |
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Format | Journal Article |
Language | English |
Published |
21.01.2002
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Subjects | |
Online Access | Get full text |
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Summary: | We present 236 new radial velocities of galaxies in the cluster A2256
measured with the WIYN Hydra multi-object spectrograph. Combined with the
previous work of Fabricant, Kent, and Kurtz (1989), we have velocities for a
total of 319 galaxies of which 277 are cluster members. In addition to the new
radial velocities, we present a 3x3 image mosaic in the R band of the central
19'x19' region of A2256, from which we obtained photometry for 861 galaxies.
These data provide strong evidence for a merger event between two groups. In
addition, we present evidence for the presence of a third group, on the outer
reaches of the system, that is just now beginning to merge with the system. |
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DOI: | 10.48550/arxiv.astro-ph/0201356 |