BRI Photometry of X-ray Emitting Galaxy Groups

Physics

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Recent N-body simulations suggest that the mass profile of systems of galaxies is universal. Remarkably, this profile fits observations of both rich (10^16 M_&sun;) and poor (10^14 M_&sun;) systems, even when they are not in dynamical equilibrium (Geller et al. 1999; Mahdavi et al. 1999). So far it has been necessary to combine many profiles to make this measurement for poor groups: the existing observations are either not deep enough, or do not reach to a large enough distance from the core. To remedy this situation, we propose to sample the membership of 13 x-ray emitting poor groups within 1.5 Mpc of the group center, to a limiting magnitude of B=20.0 (R=19.6, I=18.8). This BRI photometric survey will (1) provide the basis for future multifiber spectroscopy, (2) allow us to measure the group mass-to-light profile, and (3) relate the extended x-ray emission to the galaxy distribution and to the stellar populations of the member galaxies. We discuss preliminary results from the September 1999 observing run on the Curtis Schmidt.

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