Colliding galaxies

Details Colliding galaxies Colliding galaxies

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sciam.265...40b&link_type=abstract

Scientific American (ISSN 0036-8733), vol. 265, Aug. 1991, p. 40-47.

Astronomy and Astrophysics

Astronomy

8

Collisions, Elliptical Galaxies, Interacting Galaxies, Quasars, Astronomical Models, Computerized Simulation, Dark Matter, Galactic Mass, Halos, Molecular Clouds, Peculiar Galaxies, Stellar Luminosity

Scientific paper

An overview is presented of observations and computer simulations indicating that cosmic collisions between galaxies may form elliptical galaxies and activate quasars. Recent observations, combined with advances in theory and enhanced computer models, have demonstrated that collisions must be far more common than previously thought. Increasingly sensitive observations made at visible wavelengths have shown that even some apparently quiescent and featureless elliptical galaxies show signs of previous mergers. Scientists have discovered that the dynamics of galaxies are determined not only by visible luminous stars and gas clouds but also by halos of dark matter, which appear to represent a major fraction of a galaxy's total mass.

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