The Frequency Function of Elliptical Galaxy Intrinsic Shapes

Details The Frequency Function of Elliptical Galaxy Intrinsic Shapes The Frequency Function of Elliptical Galaxy Intrinsic Shapes

1995-10-20

arxiv.org/abs/astro-ph/9510111v1

Astronomy and Astrophysics

Astrophysics

uuencoded gziped PostScript, 22 pages including figures; To appear in The Astronomical Journal, Vol. 110, 1995

Scientific paper

10.1086/117584

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 percent 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.

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