Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266...58t&link_type=abstract
Astrophysical Journal, Part 1, vol. 266, Mar. 1, 1983, p. 58-68.
Astronomy and Astrophysics
Astrophysics
100
Astronomical Models, Galactic Structure, Anisotropy, Apertures, Elliptical Galaxies, Line Spectra, Luminosity, Radial Velocity, Velocity Distribution
Scientific paper
Under the assumptions that while mass-to-luminosity ratio is fixed, the velocity dispersion may be anisotropic, the velocity dispersion profiles of elliptical galaxies reported in the literature can all be fitted. Velocity dispersion profiles are integrated over apertures, and it is noted that M/L ratios computed by Poveda's (1958) method, and a central value for the velocity dispersion, are extremely uncertain. Slight anisotropy leads to errors of 40%, and models yielding much larger errors are possible. Central velocity dispersions measured through typical apertures vary less than 5% with aperture size for the case of a galaxy that is brighter than 14 mag. Little deviation from the Gaussian is found in calculations of spectral line profiles that would be observed through typical apertures.
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