Abstract
The systematic study of galaxy cores has become possible with high-resolution CCD surface photometry. Many cores are well resolved in a photometry program with the Canada-France-Hawaii Telescope (median stellar FWHM = 0.˝80). A general review of core structure based on this photometry is given in [1]. Here I discuss the scale parameters of cores, i. e., the central surface brightness µ 0, the core radius r c at which the surface brightness has fallen by a factor of two, and the central velocity dispersion σ. Core parameters are correlated: more luminous galaxies have larger core radii, fainter central surface brightnesses, and higher core mass-to-light ratios. These scaling laws provide constraints on theories of galaxy formation. The main purpose of this paper is to discuss the implications of the core parameter relations for the nature and origin of dwarf spheroidal (dSph) galaxies. There is a large discontinuity between the parameter correlations for E and dSph galaxies; the latter are more closely related to dwarf spiral and irregular (dS+I) galaxies [2]. A growing body of evidence suggests that dSph galaxies may have evolved from dS+I galaxies by ram-pressure stripping of their gas.
Visiting Astronomer, Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique of France, and the University of Hawaii.
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Kormendy, J. (1987). Cores of Early-Type Galaxies: The Nature of Dwarf Spheroidal Galaxies. In: Faber, S.M. (eds) Nearly Normal Galaxies. Santa Cruz Summer Workshops in Astronomy and Astrophysics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4762-3_21
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