Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361...78b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 78-97.
Astronomy and Astrophysics
Astrophysics
138
Elliptical Galaxies, Galactic Structure, Stellar Motions, Astronomical Models, Astronomical Spectroscopy, Velocity Distribution
Scientific paper
CCD surface photometry and extensive long-slit spectroscopy are used to construct detailed models of the flattened ellipticals NGC 720, 1052, and 4697. The models are combined with the Jeans equations to yield predicted fields of line-of-sight velocity dispersion and streaming velocity. By comparing these fields with observed velocities, it is concluded that none of these systems can have isotropic velocity dispersion tensors, and diminishing the assumed inclination of any given galaxy tends to decrease the line-of-sight velocity dispersion and, counterintuitively, to increase the line-of-sight rotation speeds. The ratio of the line-of-sight velocity dispersion along the minor axis to that along the major axis is found to be a sensitive diagnostic of the importance of a third integral for the galaxy's structure.
Binney James
Davies Roger L.
Illingworth Garth D.
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