Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282l...1p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. L1-L4
Astronomy and Astrophysics
Astrophysics
39
Astronomical Models, Elliptical Galaxies, Galactic Rotation, Kinetic Energy, Prediction Analysis Techniques, Virial Theorem, Astronomical Spectroscopy, Kinematics, Mathematical Models, Spectrographs
Scientific paper
In order to study the contribution of the rotation to the total kinetic energy of elliptical galaxies, we have obtained new rotation curves and velocity dispersion profiles for 34 galaxies selected for their large residuals with respect to the Fundamental Plane. For a sample of 113 galaxies from our new observations and the available literature, we have analyzed these residuals as a function of the rotational support, quantified by the Vmax/sigma0 parameter. The contribution of the rotation to the global equilibrium status of elliptical galaxies is detected and is found to be in agreement with a simple prediction based on the virial theorem for isotropic rotators. The addition of a rotation term to the Fundamental-Plane relation extends its validity to fast rotators, with even a marginal decrease in its apparent thickness.
Prugniel Ph.
Simien Francois
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