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2012MNRAS.424.1899A - Mon. Not. R. Astron. Soc., 424, 1899-1913 (2012/August-2)
Line profiles from discrete kinematic data.
AMORISCO N.C. and EVANS N.W.
Abstract (from CDS):
As an application, we turn our attention to the discrete velocity data sets of the dwarf spheroidals (dSphs) of the Milky Way. Sculptor and Fornax have data sets of ≳ 1000 line-of-sight velocities of probable member stars. In Sculptor, the symmetric deviations are everywhere consistent with velocity distributions more peaked than Gaussian. In Fornax, instead, there is an evolution in the symmetric deviations of the line profile from a peakier to more flat-topped distribution on moving outwards. Although the data sets for Carina and Sextans are smaller, they still comprise several hundreds of stars. Our methods are sensitive enough to detect evidence for velocity distributions more peaked than Gaussian. These results suggest a radially biased orbital structure for the outer parts of Sculptor, Carina and Sextans. On the other hand, tangential anisotropy is favoured in Fornax. This is all consistent with a picture in which Fornax may have had a different evolutionary history to Sculptor, Carina and Sextans.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society 2012 RAS
Journal keyword(s): galaxies: individual: Fornax dSph - galaxies: individual: Sculptor dSph - galaxies: individual: Carina dSph - galaxies: individual: Sextans dSph - galaxies: kinematics and dynamics - Local Group Isaac Newton Trust
Simbad objects: 6
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