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Title:
Rotational velocities and central velocity dispersions for a sample of S0 galaxies
Authors:
Dressler, A.; Sandage, A.
Affiliation:
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AB(Mount Wilson and Las Campanas Observatoires, Pasadena, CA)
Publication:
Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 664-680. (ApJ Homepage)
Publication Date:
02/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Angular Velocity, Disk Galaxies, Galactic Rotation, Galactic Structure, Stellar Systems, Elliptical Galaxies, Hubble Diagram, Luminosity, Spiral Galaxies, Velocity Distribution
DOI:
10.1086/160712
Bibliographic Code:
1983ApJ...265..664D

Abstract

Field S0 galaxies have bulges exhibiting high rotational velocities similar to those of spiral galaxies, as well as rapidly rotating disks. The Tully-Fisher (TF) diagram for field S0s show significant scatter, which indicates that these galaxies are a heterogeneous group in light of disk kinematics. Their spread in the TF diagram is larger than that of all Hubble-type spirals, prompting as explanations for such large variation a variation in mass/light ratio, the contamination of disk light by bulge light, and the accidental inclusion of systems lacking true disks whose kinetic energy derives from velocity dispersion rather than rotation. While some S0 galaxies seem to have no disks, their light profiles mimic the extended envelope distinguishing S0s from ellipticals, and they are rotationally flattened. These transition objects may be useful in increasing the present understanding of the formation of spheroidal stellar systems.

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