Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242...58m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 1, Feb. 1991, p. 58-68.
Astronomy and Astrophysics
Astronomy
14
Elliptical Galaxies, Galactic Structure, Interacting Galaxies, Luminous Intensity, Radial Velocity, Radio Emission, Radio Sources (Astronomy)
Scientific paper
Photometric and new spectroscopic observations of the interacting elliptical galaxies NGC4782 and NGC4783 are reported. The common envelope of the galaxy pair exhibits a regular morphology while the inner parts of both galaxies show asymmetric and nonconcentric isophotes. The galaxies have a large relative velocity of 680 km/s. Radial velocity gradients are present in both galaxies, but there is no systematic rotation. U-shaped rotation curves and U-shaped velocity dispersion profiles are found in NGC4783. The velocity dispersions near the center rise steeply with radius and reach maximum values of more than 450 km/s at 12 arcsec west of the center of NGC4783 and 14 arcsec east of the center of NGC4782. The possibility is discussed that the nonconcentric isophotes are due to a strong overall deceleration of both galaxies on their orbits, while their central parts are much less affected by the tidal deceleration.
Bender Ralf
Madejsky Rainer
Moellenhoff Claus
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