Author: Amorisco N. C. Evans N. W.
Publisher: Oxford University Press
ISSN: 0035-8711
Source: Monthly Notices of the Royal Astronomical Society, Vol.411, Iss.4, 2011-03, pp. : 2118-2136
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Abstract
ABSTRACTThis paper introduces new phase-space models of dwarf spheroidal galaxies (dSphs). The stellar component has an isotropic, lowered isothermal (or King) distribution function. A physical basis for the isotropization of stellar velocities is given by the theory of tidal stirring, whilst the isothermality of the distribution function guarantees the observed flatness of the velocity dispersion profile in the inner parts. For any analytic dark matter potential – whether of cusped or of cored form – the stellar density and velocity dispersion are analytic.The origin of the observational correlation between half-light radius
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