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AM2020–5050: an Elliptical Galaxy with an Outer Ring

Published online by Cambridge University Press:  04 August 2017

Bradley Whitmore  and
François Schweizer
Bradley Whitmore
Affiliation:
Doug McElroy, Space Telescope Science Inst., 3700 San Martin Drive, Baltimore, MD 21218
François Schweizer
Affiliation:
Dept. of Terrestrial Magnetism, Carnegie Inst. of Washington, 5241 Broad Branch Rd. NW, Washington, DC 20015

Abstract

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Photometric and spectroscopic observations show that the inner component of AM2020—5050 is an elliptical galaxy, unlike other polar-ring galaxies which have an SO disk at the center. A comparison of the central velocity dispersion with the rotational velocity in the ring suggests the presence of a nearly spherical gravitational potential. The inner component has a rapidly rotating core with rotational velocities at 3″ substantially higher than at 8″. Although the optical ring is quite narrow, Hα emission is observed all the way through the center of the galaxy, indicating the presence of an extended gaseous disk.

Type
Posters
Information
Symposium - International Astronomical Union , Volume 127: Structure and Dynamics of Elliptical Galaxies , 1987 , pp. 413 - 414
Copyright
Copyright © Reidel 1987 

References

REFERENCES

Whitmore, B.C., McElroy, D., and Schweizer, F., 1987. Ap. J., submitted.Google Scholar
Whitmore, B.C., and Kirshner, R.P., 1981. Ap. J., 250, 43.CrossRefGoogle Scholar