Arp 158: A Study of the HI
We present here 21 cm observations of Arp 158. We have performed a study of the HI to help us understand the overall formation and evolution of this system and its role in galaxy evolution.
According to the evolutionary sequence described by Hibbard & van Gorkom (1996), Arp 158 appears to be an intermediate stage merger. There seem to be three distinct knots connected by a bar embedded in luminous material. There is also a diffuse spray to the south-east.
As noted by A. Toomre (Chincarini & Heckathorn, 1973), Arp 158 bears a certain optical resemblance to NGC 520 (Arp 157). We agree with this. From our 21 cm observations of Arp 158, we also see a comparable HI content with NGC 520. Such similarities between the two galaxies could imply like formation processes. However, the HI morphologies and kinematics for both systems are quite dissimilar.
KeywordsPosition Angle Radio Astronomy Observatory Astrophysical Journal Very Large Array Tidal Tail
Unable to display preview. Download preview PDF.