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Subaru First-Light Deep Photometry of Galaxies in A 851 Field

2000; Oxford University Press; Volume: 52; Issue: 1 Linguagem: Inglês

10.1093/pasj/52.1.9

2053-051X

Masanori Iye, Fumihide Iwamuro, Toshinori Maihara, Satoshi Miyazaki, Sadanori Okamura, Kazuhiro Shimasaku, Chris Simpson, Masayuki Akiyama, Hiroyasu Ando, Tetsuo Aoki, Tsutomu Aoki, Yoshihiro Chikada, Mamoru Doi, Noboru Ebizuka, Takeo Fukuda, Hisanori Furusawa, Miwa Goto, M. Hamabe, Ryuji Hata, Masahiko Hayashi, Saeko S. Hayashi, T. Horaguchi, Shinichi Ichikawa, Takashi Ichikawa, Masatoshi Imanishi, Katsumi Imi, Motoko Inata, S. Isobe, Yoichi Itoh, Junichi Iwai, Norio Kaifu, Yukiko Kamata, Tomio Kanzawa, Hiroshi Karoji, Nobunari Kashikawa, Taichi Kato, Wataru Kawasaki, Masahiko Kimura, Naoto Kobayashi, Yukiyasu Kobayashi, Keiichi Kodaira, Yutaka Komiyama, George Kosugi, Tomio Kurakami, Yoshitaka Mikami, Akihiko Miyashita, Takashi Miyata, Y. Mizumoto, Kentaro Motohara, M. Nakagiri, Koich Nakajima, Kyoko Nakamura, Fumiaki Nakata, Kyoji Nariai, Eiji Nishihara, Jun Nishikawa, Shiro Nishimura, Tetsuo Nishimura, Tetsuo Nishino, Kunio Noguchi, Takeshi Noguchi, Junichi Noumaru, Ryusuke Ogasawara, Norio Okada, Kiichi Okita, Koji Omata, Norio Oshima, Masashi Otsubo, Shin Oya, Goro Sasaki, Toshiyuki Sasaki, Yasuhiro Sawada, K. Sekiguchi, M. Sekiguchi, Ian Shelton, Hiroshi Suto, Katsuyuki Suzuki, Tomoyuki Taguchi, Hideki Takami, Tadafumi Takata, Naruhisa Takato, Yoichi Tamura, Hirohisa Tanabe, Kyoko K. Tanaka, Wataru Tanaka, Hiroshi Terada, Daigo Tomono, Yasuo Torii, Hiroyuki Tsukamoto, Tomonori Usuda, J. Watanabe, Masaru Watanabe, Masafumi Yagi, Takuya Yamashita, Yasumasa Yamashita, Naoki Yasuda, M. Yoshida, Shigeomi Yoshida, Masami Yutani,

Galaxies: Formation, Evolution, Phenomena

We report on the results of optical and near-infrared photometry of the cluster of galaxies A 851 (= CL 0939+4713) carried out as one of the first-light observations of the 8.2 m Subaru telescope on Mauna Kea. Images as sharp as 0″.3 FWHM in K′ and 0″.45 in R were obtained in these observations. The 3σ limiting magnitudes for points sources in 0″.3 seeing with a 0″.6 software aperture were shown to go down to R = 28.1, J = 25.1, and K′; = 24.0, respectively, for about 1 hour integration. Subaru photometry of the galaxies in this cluster has shown in its color-magnitude diagrams a well-defined sequence of the early-type galaxy population that is consistent with the track predicted for a single-burst passive-evolution model of galaxies at z = 0.4. We attempted a morphological classification of galaxies in the Subaru R-band image using the Cin method, and found that discrimination between ellipticals and spirals can be achieved fairly consistently with the types assigned by MORPHs on the HST F702W image down to R < 23. A weak lensing analysis made on the Subaru R-band image yielded a reconstructed surface mass-density distribution that shows a significant maximum corresponding to the peak of the smoothed luminosity distribution of cluster galaxies. We found no significant excess of faint and/or small galaxies in the putative cluster area around the z = 2 quasar and no difference in the colors for galaxies in this area from those in the main cluster either. Two extremely red objects (ERO) with R – K > 6 are newly identified in the field. The colors of the reddest, disk-shaped galaxy R1 are found compatible with those of an unreddened E/S0 galaxy at z = 1.6.