Ring galaxies. I

Details Ring galaxies. I Ring galaxies. I

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...208..650t&link_type=abstract

Astrophysical Journal, vol. 208, Sept. 15, 1976, pt. 1, p. 650-661.

Astronomy and Astrophysics

Astrophysics

131

Astronomical Models, Elliptical Galaxies, Galactic Structure, Ring Galaxies, Spiral Galaxies, Astronomical Spectroscopy, Classifications, Galactic Nuclei, Radial Velocity, Three Dimensional Models, Ubv Spectra, Visual Photometry

Scientific paper

A classification scheme is proposed for ring galaxies, or R galaxies, with three subclasses. RE galaxies have crisp empty rings; RN galaxies are like REs but for an off-center nucleus; RK galaxies have single dominant knots or condensations in their rings. From the projected ellipticities of the rings and the relative positions of their companions, simple three-dimensional models are deduced. With the help of these models, photometric and spectroscopic observations we employed to estimate global properties of R galaxies. They have galactic sizes, masses of the order of 100 billion solar masses, and kinematical time scales of the order of 100 million yr. The present interpretation of these data suggests that rings are formed when an intruding galaxy passes nearly through the center of a normal disk galaxy.

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