Dark matter and dynamics in the Hercules Cluster (A2151)

Details Dark matter and dynamics in the Hercules Cluster (A2151) Dark matter and dynamics in the Hercules Cluster (A2151)

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404...81b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 81-93.

Mathematics

Dynamical Systems

24

Dark Matter, Dynamical Systems, Galactic Clusters, Galactic Mass, Gravitational Effects, Kinematics, Luminosity, Radio Astronomy

Scientific paper

New 21-cm observations of faint spiral galaxies in the Hercules cluster (A2151) are presented in order to investigate the dynamics throughout the cluster core, out to a projected radius of 1.8/h Mpc. The global dynamical mass of Hercules is calculated using the virial theorem and the projected mass estimator. These masses lie in the range 3-9 x 10 exp 14 solar masses. The importance of subclustering in A2151 by eye is examined via the statistical test of Dressler & Shectman (1988), and by considering the effects of the detected substructure on the dynamical mass determination. The clumpy distribution is interpreted as a sign that the galaxies in the cluster have not reached dynamical equilibrium in the gravitational potential.

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