Multiaperture UBV RIzJHK Photometry of Galaxies in the Coma Cluster

We present a set of UBV RIzJHKs photometry for 745 J +H band selected objects in a 22.5 × 29.2 region centered on the core of the Coma cluster. This includes 516 galaxies and is at least 80% complete to H = 16, with a spectroscopically complete sample of 111 cluster members (nearly all with morphological classification) for H < 14.5. For each object we present total Kron (1980) magnitudes and aperture photometry. As an example, we use these data to derive color-magnitude relations for Coma early-type galaxies, measure the intrinsic scatter of these relations and its dependence on galaxy mass, and address the issue of color gradients. We find that the color gradients are mild and that the intrinsic scatter about the color-magnitude relation is small (∼ 0.05 mag in U−V and less than ∼ 0.03 in B − R, V − I or J −K). There is no evidence that the intrinsic scatter varies with galaxy luminosity, suggesting that the cluster red sequence is established at early epochs over a range of ∼ 100 in stellar mass. Subject headings: galaxies: formation and evolution; galaxies: photometry; galaxies: clusters: individual: Coma Jet Propulsion Laboratory, California Institute of Technology, MS169-327, 4800 Oak Grove Drive, Pasadena, CA 91109 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile Department of Astronomy, University of Florida, Gainesville, FL 32611 Physics Department, University of California, Davis, 1 Shields Avenue, CA 95616 Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratories, Livermore, CA 94550 National Optical Astronomy Observatories, 950 N. Cherry Avenue, Tucson AZ 85719 California Institute of Technology, 1200 E. California Boulevard, Pasadena CA 91125 Kingbright Electronics, 3F, 317-1, Sec. 2, Chung Shan Rd. Chung Ho, Taipei Hsien, Taiwan