Morphology and kinematics of the interacting elliptical galaxies NGC750 and NGC751 = ARP 166 - Velocity fields of tidally distorted elliptical galaxies

Details Morphology and kinematics of the interacting elliptical galaxies NGC750 and NGC751 = ARP 166 - Velocity fields of tidally distorted elliptical galaxies Morphology and kinematics of the interacting elliptical galaxies NGC750 and NGC751 = ARP 166 - Velocity fields of tidally distorted elliptical galaxies

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..348m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 348-356.

Astronomy and Astrophysics

Astrophysics

5

Elliptical Galaxies, Galactic Nuclei, Galactic Structure, Interacting Galaxies, Velocity Distribution, Brightness Distribution, Isophotes, Radial Velocity

Scientific paper

The interacting galaxies NGC750 and 751 are investigated by means of photometric and spectroscopic observations and compared to the galaxy pair NGC4782 and 4783. The morphological and kinematical properties of the pair are discussed, and the examination of the dynamical properties of both pairs is used to develop a scenario to describe the encounter of 750 and 751. The luminosity profiles of both galaxies deviate from the r exp 1/4 law at all radii, and the shapes of near-central isophotes suggest the slow evolution of their time-varying potentials. NGC750 exhibits radial velocity curves that are almost flat while those of 751 have large variations; both galaxies have asymmetric and radially increasing velocity-dispersion curves. Both galaxies, therefore, are characterized by strong tidal perturbations, and a scenario is developed to describe the galactic encounter as deeply penetrating and low-velocity. Violent tidal interaction is related to tidal coupling between stars on prograde orbits and the bulk orbital motion.

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