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The Astronomical Journal


Department of Physics and Astronomy


We have measured redshifts and Kron-Cousins R-band magnitudes for a sample of galaxies in the poor cluster AWM 7. We have measured redshifts for 172 galaxies; 106 of these are cluster members. We determine the luminosity function (LF) from a photometric survey of the central 1.2 × 1.2 h-1 Mpc. The LF has a bump at the bright end and a faint-end slope of α = -1.37 ± 0.16, populated almost exclusively by absorption-line galaxies. The cluster velocity dispersion is lower in the core (~530 km s-1) than at the outskirts (~680 km s-1), consistent with the cooling flow seen in the X-ray. The cold core extends ~150 h-1 kpc from the cluster center. The Kron-Cousins R-band mass-to-light ratio of the system is 650 ± 170 h M/L, substantially lower than previous optical determinations, but consistent with most previous X-ray determinations. We adopt H0 = 100 h km s-1 Mpc-1 throughout this paper; at the mean cluster redshift (5247 ± 76 km s-1), 1 h-1 Mpc subtends 655.