Mathematics – Probability
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543605t&link_type=abstract
American Astronomical Society, AAS Meeting #215, #436.05; Bulletin of the American Astronomical Society, Vol. 42, p.385
Mathematics
Probability
Scientific paper
We present new radial velocity measurements of 147, 65 and 14 galaxies in the rich galaxy clusters Abell 154, Abell 104 and Abell 71, respectively. Data was collected using the Hydra Multi-Object Spectrograph on the WIYN 3.5-meter telescope at Kitt Peak National Observatory. Preliminary results exhibit complex velocity structures consistent with previously unidentified substructure. In the hierarchical merging scenario, massive objects grow in mass by accreting less-massive objects. We discuss the dynamical status of each cluster in the context of the hierarchical merging scenario and present these findings as a part of an ongoing study of the environment of galaxy clusters and the evolution of early-type galaxies.
Statistical tests are used to quantify the significance of any observed substructure. Gravitational binding tests are used to determine the probability that the subclusters are interacting. We use multi-wavelength data from the literature to support the validity of the presence of the observed substructure in each cluster. Substructure is any correlation between the galaxy spatial distribution and their radial velocities. We discuss the conclusions of the optical data and any correlations with data from the literature, and we describe the overall environment of each of the clusters.
Berrington Robert Charles
Tobin Ryan W.
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