Optical and CO Radio Observations of Poor Cluster Zwicky 1615.8+3505

Details Optical and CO Radio Observations of Poor Cluster Zwicky 1615.8+3505 Optical and CO Radio Observations of Poor Cluster Zwicky 1615.8+3505

1998-07-08

arxiv.org/abs/astro-ph/9807072v3

Astronomy and Astrophysics

Astrophysics

LaTeX manuscript (text.tex, use PASJ style files), four PS figures (fig[a-d].ps), and three PASJ style files. text.tex, figb.p

Scientific paper

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.

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