The Dynamics of the Merging Galaxy Cluster System A2256: Evidence for a New Subcluster | Zendy

Robert C. Berrington | Zendy; P. M. Lugger | Zendy; H. N. Cohn | Zendy

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The Dynamics of the Merging Galaxy Cluster System A2256: Evidence for a New Subcluster

Author(s) -

Robert C. Berrington,

P. M. Lugger,

H. N. Cohn

Publication year - 2002

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/339840

Subject(s) - merge (version control) , spectrograph , astrophysics , physics , galaxy , cluster (spacecraft) , galaxy cluster , photometry (optics) , radial velocity , astronomy , brightest cluster galaxy , computer science , stars , spectral line , information retrieval , programming language

We present 236 new radial velocities of galaxies in the cluster A2256measured with the WIYN Hydra multi-object spectrograph. Combined with theprevious work of Fabricant, Kent, and Kurtz (1989), we have velocities for atotal of 319 galaxies of which 277 are cluster members. In addition to the newradial velocities, we present a 3x3 image mosaic in the R band of the central19'x19' region of A2256, from which we obtained photometry for 861 galaxies.These data provide strong evidence for a merger event between two groups. Inaddition, we present evidence for the presence of a third group, on the outerreaches of the system, that is just now beginning to merge with the system.Comment: submitted to the AJ for publication. (13 figures, 10 tables

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