NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-18 T10:00:38 PDT
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For refcode 1999PASJ...51..285T:
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Copyright by Astronomical Society of Japan. 1999PASJ...51..285T Optical and CO Radio Observations of Poor Cluster Zwicky 1615.8+3505 Akihiko TOMITA Department of Earth and Astronomical Sciences, Faculty of Education, Wakagama University, Wakagama 640-8510 E-mail (AT): atomita@centcr. tvakayama-u. ac.jp Hideo MAEHARA Qkayama Astrophysical Observatory, National Astronomical Observatory, Kamogata-cho, Okayama 719-0232 Tsutomu T. TAKEUCHI and Kouichiro NAKANISHI Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 and Mareki HONMA, Yashinori TUTUI, and Yoshiaki SOFUE Institute of Astronomy, School of Science, The University of Tokyo, Mitaka, Tokyo 181-8588 (Received 1998 July 10; accepted 1999 March 22) Abstract The cluster Zwicky 1615.8+3505 is considered to be a dynamically young poor cluster. To investigate the morphology and star-formation activity of galaxies under the environment of a dynamically young poor cluster, we have performed V, R, and I surface photometry, optical low-resolution spectroscopy, and ^12^CO (J = 1-0) line observations for member galaxies. Our data show that more than 90% of the observed galaxies show regular morphologies and no star-formation activities,indicating that the environment does not affect these galaxy properties. Among sixteen galaxies observed, only NGC 6104 shows a significant star-formation activity, and shows a distorted morphology, indicating a tidal interaction. This galaxy contains double knots, and only one knot possesses Seyfert activity, though the sizes and luminosities are similar to each other; we. also discuss this feature. Key words: Clusters of galaxies: individual (Zwicky 1615.8+3505) - Galaxies: individual (NGC 6104)-Poor clusters
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