The Intrinsic Shape Distribution of a Sample of Elliptical Galaxies

Details The Intrinsic Shape Distribution of a Sample of Elliptical Galaxies The Intrinsic Shape Distribution of a Sample of Elliptical Galaxies

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120..110b&link_type=abstract

The Astronomical Journal, Volume 120, Issue 1, pp. 110-122.

Astronomy and Astrophysics

Astronomy

31

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Kinematics And Dynamics, Galaxies: Structure

Scientific paper

We apply the dynamical modeling approach of Statler to 13 elliptical galaxies from the Davies & Birkinshaw sample of radio galaxies to derive constraints on their intrinsic shapes and orientations. We develop an iterative Bayesian algorithm to combine these results to estimate the parent shape distribution from which the sample was drawn, under the assumption that this parent distribution has no preferred orientation. In the process we obtain improved estimates for the shapes of individual objects. The parent shape distribution shows a tendency toward bimodality, with peaks at the oblate and prolate limits. Under minimal assumptions about the galaxies' internal dynamics, 35% of the objects would be strongly triaxial (0.2

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