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Color of Dwarf Galaxies in the Coma Cluster

  • S. Okamura (a1), Y. Komiyama (a1), M. Sekiguchi (a2), N. Kashikawa (a3), K. Shimasaku (a1), M. Yagi (a1), M. Doi (a1), N. Yasuda (a1), W. Kawasaki (a1), M. Iye (a3), D. Carter (a4) and B. Mobasher (a5)...

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We observed three 0.44 square degree fields centered on the Coma cluster center (Coma-1), about 1 degree SW of the Coma center (Coma-3), and on a control field in SA57 with the mosaic CCD camera at the prime focus of the 4.2-m William Herschel Telescope. We detected 5628, 5020, and 4323 galaxies down to R = 22 mag in Coma-1, Coma-3, and SA57 fields, respectively. We measure the magnitude and color within the variable aperture r 90 in which about 90% of the total flux is included. The histograms of (B–R) colors of galaxies are made for four magnitude bins of width ΔR = 2 mag covering 13 < R < 21 mag for each of the three fields. The mean colors and the 1σ scatters of the Coma galaxies are obtained by a histogram subtraction technique (Coma-1/3 minus SA57). We find a very shallow slope of the color-magnitude relation (CMR), Δ(B–R)/ΔR=−0.0037, which indicates nearly a constant (B–R) color over 6 magnitude in 15 < R < 21 mag (−19.5 < M R < −13.5 at Coma cluster). Dwarf galaxies are dominant in this magnitude range, and we conclude that the mean color of dwarf galaxies in the Coma clusters is nearly constant at (B–R) ∼ 1.6–1.7, which is similar to the color of the faint end of giant elliptical galaxies.

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Color of Dwarf Galaxies in the Coma Cluster

  • S. Okamura (a1), Y. Komiyama (a1), M. Sekiguchi (a2), N. Kashikawa (a3), K. Shimasaku (a1), M. Yagi (a1), M. Doi (a1), N. Yasuda (a1), W. Kawasaki (a1), M. Iye (a3), D. Carter (a4) and B. Mobasher (a5)...

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