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Optical and CO Observations of Poor Cluster

By Akihiko Tomita, Hideo Maehara, Tsutomu T. Takeuchi, Kouichiro Nakanishi, Mareki Honma, Yoshinori Tutui and Yoshiaki Sofue


(Received; accepted) 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 dynamically young poor cluster, we have performed V, R, and I surface photometry, optical low-resolution spectroscopy, and 12CO (J = 1 − 0) line observations for member galaxies. Our data show that more than 90 % of observed galaxies show regular morphologies and no star 1 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

Topics: ∗ Based on observations made at Okayama Astrophysical Observatory (OAO, Kiso Observatory
Year: 1999
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