  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 12CO
(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.

Astrophysics