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Date and Time of the Query: 2019-07-17 T22:32:22 PDT
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For refcode 2004ApJ...601..805U:
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Copyright by American Astronomical Society. Reproduced by permission
2004ApJ...601..805U The H{alpha} Luminosity Function of the Galaxy Cluster A521 at z = 0.25 Kazuyoshi Umeda, Masafumi Yagi, Sanae F. Yamada, Yoshiaki Taniguchi, Yasuhiro Shioya, Takashi Murayama, Tohru Nagao, Masaru Ajiki, Shinobu S. Fujita, Yutaka Komiyama, Sadanori Okamura, and Kazuhiro Shimasaku Abstract. We present an optical multicolor-imaging study of the galaxy cluster A521 at z=0.25, using Suprime-Cam on the Subaru Telescope, covering an area of 32' x 20' (9.4x5.8h^-2^_50_ Mpc^2^ at z=0.25). Our imaging data taken with both a narrowband filter, NB816 ({lambda}_0_=8150 A and {DELTA}{lambda}=120 A), and broadband filters, B,V,R_C_,i', and z', allow us to find 165 H{alpha} emitters. We obtain the H{alpha} luminosity function (LF) for the cluster galaxies within 2 Mpc; the Schechter parameters are {alpha}=-0.75+/-0.23, {phi}^*^=10^-0.45^ to 10^-0.05^ Mpc^-3^, and L^*^=10^41.86^ to 10^42.2^ ergs s^-1^. Although the faint-end slope {alpha} is consistent with that of the local cluster H{alpha} LFs, the characteristic luminosity L^*^ is about 6 times (or ~2 mag) brighter. This strong evolution implies that A521 contains more active star-forming galaxies than the local clusters, being consistent with the observed Butcher-Oemler effect. However, the bright L^*^ of A521 may be, at least in part, due to the dynamical condition of this cluster. Keywords: Galaxies: Clusters: Individual: (A521) Galaxies: Evolution, Galaxies: Luminosity Function, Mass Function
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