Internal kinematics of low-luminosity ellipsoidal galaxies

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Dwarf Galaxies, Elliptical Galaxies, Galactic Structure, Brightness Distribution, Charge Coupled Devices, Galactic Evolution, Luminosity, Supernovae

Scientific paper

Spectroscopic observations are presented of ten low-mass ellipsoidal galaxies having luminosities in the range where the luminosity functions of luminous ellipticals and low surface-brightness dwarf ellipticals overlap. The sample covers a large range in effective surface brightness, from values typical of genuine dwarfs to those of compact, M 32-like, ellipticals. In contrast to what may be expected from the extrapolation of the result of Davies et al. (1983), about half of the objects are not rotationally flattened. However, only objects fainter than M(T) = -18.0 mag and having low surface brightness are considerably anisotropic, indicating that: (1) the result of Davies et al. (1983) still describes the overall trend between kinematics and luminosity for elliptical galaxies brighter than M(T) = -18 mag in the correct way, and (2) low surface brightness dwarf ellipsoidals may be in general not rotationally flattened.

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