Other
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1411p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 4, p. 1411-1419.
Other
78
Astronomical Photometry, Dwarf Galaxies, Elliptical Galaxies, Mass To Light Ratios, Radial Velocity, Star Distribution, Velocity Distribution, Brightness Distribution, Galactic Nuclei, Galactic Structure, Metallicity, Stellar Color
Scientific paper
We present new measurements of the central stellar velocity dispersions (sigma) of dwarf elliptical galaxies (dEs), most of them of the nucleated variety. The data consist of photon counting spectra with spectral resolution of 12 and 32 km/s, and CCD data at 8 and 18 km/s (FWHM). The measured dispersions range from 14 to 39/km, and are lower than previous measurements done at more coarse resolution by about 50 percent. M/L ratios are derived for the galaxies. These are not unusually high (1-7, in solar units), but the change in M/L with luminosity for all dE galaxies confirms a prediction by Dekel and Silk (1986), as does the observed relation between L and velocity dispersion. We use the data to investigate the fundamental plane for dEs. A limited sample for which complete data exist (L, Re, Se, and sigma) indicates that a single parameter accurately predicts the three other structural parameters.
Caldwell Nelson
Peterson Ruth C.
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