Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aipc..336..433b&link_type=abstract
Dark matter. AIP Conference Proceedings, Volume 336, pp. 433-436 (1995).
Physics
2
Hydrodynamics, Origin, Formation, Evolution, Age, And Star Formation
Scientific paper
We present an analysis of a simulated rich cluster dominated by cold dark matter. Here, we focus on the dynamics of collapsed dark matter halos which may be associated with galaxies. We use projected positions and velocities of both dark matter particles and of halos to assess several conventional measures of cluster mass. The results indicate that the measures give reasonable results for dark matter particles but cause overestimates of cluster mass when applied to halos. In searching for the source of the discrepancies, we find that tidal disruption and dynamical friction do not induce a significant bias in the projected velocity dispersion of halos; however, an antibias in the spatial distribution of halos relative to that of the total mass appears to be most problematic for cluster mass estimates. We conclude that over and above the usual concerns about the applicability of virial equilibrium to clusters, any bias can adversely affect cluster mass estimates and one must question their reliability as applied to observed clusters.
Bromley Benjamin C.
Quinn Peter J.
Warren Michael S.
Zurek Wojciech Hubert
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