Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..879d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 879-902.
Other
107
Astronomical Spectroscopy, Elliptical Galaxies, Galactic Rotation, Galactic Structure, Velocity Distribution, Anisotropy, Calibrating, Error Analysis, Fourier Analysis, Galactic Radiation, Globular Clusters, Stellar Mass, Stellar Motions, Stellar Spectra
Scientific paper
Measurements of the velocity dispersion profiles and rotation curves of one lenticular and seven elliptical galaxies are presented. Long-slit spectra along the major axes of the eight early-type galaxies covering a range of ellipticities were obtained in the range 5000 to 6000 A, and calibrated for small-scale sensitivity variations, sky brightness and wavelength and intensity; velocities and velocity dispersions were measured using direct and Fourier techniques. Estimates of the velocity dispersion and rotation velocities made by the two methods are shown to be in good agreement, and the low rotation velocities found by other authors are confirmed. All the galaxies are observed to exhibit decreasing or constant values of the velocity dispersion with increasing radius. Examination of the velocity dispersion profiles of the galaxies reveals those galaxies with dispersion profiles falling more steeply than predicted by isotropic models to be dominated by radial motions at large radii, and those with flat dispersion profiles to be easily interpreted in terms of increasing mass-to-light ratio with radius. Detailed descriptions of the dynamical properties of individual galaxies are also presented.
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