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V. Desai, D. Reed, J. J. Dalcanton, L. Mayer, T. Quinn, F. Governato (UW)
We construct circular velocity functions for galaxies in nearby (z < 0.1) clusters using the Tully Fisher and Fundamental Plane Relations and surface photometry from the Sloan Digital Sky Survey Early Data Release. These are compared to halo circular velocity functions for a large number of clusters drawn from a high-resolution (~106 particles within the virial radius of each cluster) N-body simulation with a \LambdaCDM cosmology. We find that, for circular velocities greater than about 200 km s-1, the velocity distribution of cluster substructure in N-body simulations matches the observations. Below this limit, galaxies are overpredicted to a larger degree than are field galaxies. We also explore the environmental dependence of the observed and simulated velocity functions.
Funding for the SDSS is provided by the Alfred P. Sloan Foundation, NASA, NSF, DoE, Monbukagakusho, the Max Planck Society and the member institutions. The SDSS web site is http://www.sdss.org/. This work has also been supported by a NASA Graduate Student Research Program Fellowship.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.