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On the rotation of elliptical galaxiesThe tensor virial theorem is applied to models of early-type galaxies. First the theorem is applied to rotating elliptical galaxies whose constant-density surfaces are similar ellipsoids. A relationship is obtained between the observed rotations and the forms of generally triaxial galaxies. By applying the results of Robert (1962) to the evaluation of the components of the Chandrasekhar tensor which occurs in this relationship, it is found that the form of a galaxy that lacks global velocity anisotropy uniquely determines the ratio of its rotational and random kinetic energies independently of the radial density profile of that galaxy. A distribution of three-dimensional prolate spheroids is derived which accounts for the observed distribution of ellipticities reported by Sandage, Freeman, and Stokes (1970). This is then used to derive curves giving the expected frequency of occurrence of galaxies of given rotational velocities for each of a number of different apparent elongations on the sky. It is found that if elliptical galaxies are prolate, there should be little correlation between apparent ellipticity and rotation velocity.
Document ID
19780051304
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Binney, J.
Date Acquired
August 9, 2013
Publication Date
May 1, 1978
Publication Information
Publication: Royal Astronomical Society
Subject Category
Astrophysics
Accession Number
78A35213
Funding Number(s)
CONTRACT_GRANT: NGL-05-003-497
CONTRACT_GRANT: NGR-05-003-578
Distribution Limits
Public
Copyright
Other

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