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The Distribution and Kinematics of Neutral Hydrogen in NGC 807

Published online by Cambridge University Press:  04 August 2017

L. L. Dressel
L. L. Dressel*
Affiliation:
Department of Space Physics and Astronomy, Rice University, P. O. Box 1892, Houston, TX 77251, U.S.A.

Abstract

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I have detected 21 cm line emission from neutral hydrogen in the giant elliptical galaxy NGC 807 at Arecibo Observatory, and I have mapped this emission with the VLA. Unlike the active and dwarf ellipticals that have been mapped thus far, NGC 807 has a fairly regular disk of gas rotating about the apparent optical minor axis. Combined with observations of active ellipticals, this observation suggests that two classes of HI-rich ellipticals may exist: ellipticals which have accreted gas and become active recently, and quiescent ellipticals which have either produced gas internally or accreted it so long ago that it has reached dynamical equilibrium.

Type
Posters
Information
Symposium - International Astronomical Union , Volume 127: Structure and Dynamics of Elliptical Galaxies , 1987 , pp. 423 - 424
Copyright
Copyright © Reidel 1987 

References

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