Hierarchical pairs and the evolution of elliptical galaxies

Details Hierarchical pairs and the evolution of elliptical galaxies Hierarchical pairs and the evolution of elliptical galaxies

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222....5p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 5-26.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Photometry, Elliptical Galaxies, Galactic Evolution, Galactic Structure, Companion Stars, Faint Objects, Hierarchies

Scientific paper

Consideration is given to the photometric and kinematic characteristics of galaxies in eight close pairs of ellipticals consisting of a bright galaxy and a compact faint companion. Redshifts and central velocity dispersions are determined from high-dispersion spectra. Evidence is presented for interaction in the pairs. The mean surface brightness and central velocity dispersions of the galaxies are tightly correlated with luminosity. Two sequences of ellipticals are defined, based on the work of Michard (1979). The galaxies in this study are sequence I galaxies. It is suggested that sequence II galaxies evolve toward sequence I galaxies through dissipation of internal energy and loss of angular momentum.

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