ARP 118, an interacting system with extreme velocity gradients

Details ARP 118, an interacting system with extreme velocity gradients ARP 118, an interacting system with extreme velocity gradients

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216...11h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 11-18.

Astronomy and Astrophysics

Astrophysics

20

Galactic Mass, H Ii Regions, Interacting Galaxies, Seyfert Galaxies, Elliptical Galaxies, Galactic Evolution, Radial Velocity, Star Formation Rate, Starburst Galaxies

Scientific paper

The photometry and kinematics of the interacting galaxy system Arp 118 are presented. Its eastern component, NGC 1144, is dominated by a ring-like structure of giant H II regions, the radial velocities of which vary by 1100 km/s. The central mission-line region of NGC 1144 shows velocity splitting of 280 km/s and a Seyfert 2 spectrum. Dynamical models that include a close encounter with the elliptical companion NGC 1143 indicate rotational velocities of about 700 km/s 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.

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