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Record 48 of 4160
Velocity mapping and models of the elliptical galaxies NGC 720, NGC 1052, and NGC 4697
External Online Source: doi:10.1086/169169
Author and Affiliation:
Binney, J. J.(Steward Observatory, Tucson, AZ, Oxford, University)
Davies, Roger L.(National Optical Astronomy Observatories, Tucson, AZ, Oxford, University)
Illingworth, Garth D.(Lick Observatory, California, University)
Abstract: 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.
Publication Date: Sep 20, 1990
Document ID:
(Acquired Nov 28, 1995)
Accession Number: 90A48909
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 361; 78-97
Publisher Information: United States
Contract/Grant/Task Num: NAS5-29225
Financial Sponsor: NASA; United States
Organization Source: Arizona Univ.; Tucson, AZ, United States
Oxford Univ.; Oxford, United Kingdom
National Optical Astronomy Lab.; Tucson, AZ, United States
Lick Observatory; Santa Cruz, CA, United States
California Univ.; Santa Cruz, CA, United States
Description: 20p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 78-97.
Availability Source: Other Sources
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