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Dynamics of the Hydra I galaxy cluster
Fitchett, Michael; Merritt, David
AA(Toronto, University, Canada), AB(Toronto, University, Canada)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. 18-34. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Astronomical Models, Computational Astrophysics, Galactic Clusters, Interacting Galaxies, Mass Distribution, Red Shift, Virial Theorem, X Ray Sources
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This paper examines the dynamics of the Hydra I cluster. This cluster has circularly symmetric galaxy and X-ray distributions, and a velocity histogram that is close to Gaussian. However, the velocity distribution of galaxies near the cluster center is very flat. Using various statistical tests, the probability that the observed velocities were drawn from a normal distribution, or from a set of spherical equilibrium models is calculated. Based on several of the tests, the data are inconsistent with the models at the approximately 2.4 sigma level. The possibility that substructure is important in this cluster is therefore considered. It is found that a model that is spherically symmetric at large radii, and clumpy at small radii, is more consistent with the kinematical data. The locations and the velocities of the brighter cluster galaxies also lend support to this hypothesis. Such a model can also explain why Hydra I does not lie along the L(x)-sigma relation for galaxy clusters.

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