The Frequency Function of Elliptical Galaxy Intrinsic Shapes
Abstract
We present fully nonparametric estimates of the frequency function of elliptical galaxy intrinsic shapes under the axisymmetric and triaxial hypotheses. If elliptical galaxies are assumed to be oblate or prolate, the frequency function of intrinsic shapes is negative for axis ratios near unity due to the lack of apparently round galaxies. Both axisymmetric hypotheses are found to be inconsistent at the 99% level with the data. Triaxial intrinsic shapes are fully consistent with the data; a number of possible triaxial frequency functions are presented, some of which exhibit strong bimodality. We also compute the "maximum entropy" distribution of intrinsic shapes under the triaxial hypothesis.
 Publication:

The Astronomical Journal
 Pub Date:
 September 1995
 DOI:
 10.1086/117584
 arXiv:
 arXiv:astroph/9510111
 Bibcode:
 1995AJ....110.1039T
 Keywords:

 GALAXIES: ELLIPTICAL AND LENTICULAR;
 GALAXIES: KINEMATICS AND DYNAMICS;
 Astrophysics
 EPrint:
 uuencoded gziped PostScript, 22 pages including figures