Optical and CO radio observations of poor cluster Zwicky 1615.8+3505

The cluster Zwicky 1615.8+3505 is considered to be a dynamically young poor cluster. To investigate the morphology and star-formation activity of gala xies under the environment of a dynamically young poor cluster, we have per formed V, R, and I surface photometry, optical low-resolution spectroscopy, and (CO)-C-12 (J = 1-0) line observations for member galaxies. Our data sh ow that more than 90% of the observed galaxies show regular morphologies an d no star-formation activities, indicating that the environment does not af fect these galaxy properties. Among sixteen galaxies observed, only NGC 610 4 shows a significant star-formation activity, and shows a distorted morpho logy, indicating a tidal interaction. This galaxy contains double knots, an d only one knot possesses Seyfert activity, though the sizes and luminositi es are similar to each other; we also discuss this feature.