Neutral Hydrogen in ARP 158
We present 21 cm observations of Arp 158. We have performed a study of the neutral hydrogen (H i) to help us understand the overall formation and evolution of this system. This is a disturbed system with distinct optical knots connected by a linear structure embedded in luminous material. There is also a diffuse spray to the southeast. The H i seems to be made up of three distinct, kinematically separate systems. Arp 158 bears a certain optical resemblance to NGC 520 (Arp 157), which has been identified as a mid-stage merger. From our 21 cm observations of Arp 158, we also see a comparable H i content with NGC 520. These similarities suggest that Arp 158 is also an intermediate-stage merger.
The Astronomical Journal, Vol. 128, 985-996, 2004 September, 985-996.