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For refcode 1992A&A...262...52B:
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1992A&A...262...52B The role played by rotation and random motions in elliptical galaxies G. Busarello, G. Longo, and A. Feoli Osservatorio Astronomico di Capodimonte, Via Moiariello 16,I-80131 Napoli, Italy Department of Theoretical Physics, University of Salerno, I-84081 Baronissi (Salerno), Italy Received June 13, 1991; accepted February 24, 1992 Abstract The observable kinematical quantities (rotation velocity and velocity dispersion) of elliptical galaxies are affected, among other things, by the integration of the light along the line of sight. We present here a method to spatially deproject the rotation velocity curve and the velocity dispersion profile. The application to a sample of 54 ellipticals shows that, as is it widely recognized, the total kinetic energy originates mainly from the random motions, and that there is no correlation between rotation and velocity dispersion. If the correction with respect to the line-of-sight integration is taken into account, the correlation between the total absolute magnitude and the rotation parameter log (V/{sigma})^*^ turns out to be rather weak, while boxy and disky ellipticals appear to be separated both in the (T_V_, T_{sigma}) plane and in the [M_B_,log(V/{sigma})^*^] plane, thus confirming the existence of different dynamical properties between these two classes of objects. Key words: galaxies: elliptical - galaxies: kinematics and dynamics of - galaxies: structure of - galaxies: general
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