ARP 118, an interacting system with extreme velocity gradients.
Abstract
The photometry and kinematics of the interacting galaxy system Arp 118 are presented. Its eastern component, NGC 1144, is dominated by a ringlike structure of giant H II regions, the radial velocities of which vary by 1100 km s^-1^. The central EL region of NGC 1144 shows velocity splitting of 280 km s^-1^ and a Seyfert 2 spectrum. Dynamical models that include a close encounter with the elliptical companion NGC 1143 indicates rotational velocities of ~700 km s^-1^ and lead to high values for the mass of NGC 1144 and its M/L ratio. NGC 1144 may be itself a merger in an early stage.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1989
- Bibcode:
- 1989A&A...216...11H
- Keywords:
-
- Galactic Mass;
- H Ii Regions;
- Interacting Galaxies;
- Seyfert Galaxies;
- Elliptical Galaxies;
- Galactic Evolution;
- Radial Velocity;
- Star Formation Rate;
- Starburst Galaxies;
- Astrophysics