optical galaxy

optical galaxy

[′äp·tə·kəl ′gal·ik·sē]
(astronomy)
One of the galaxies that appear as nearly starlike, generally having compact nuclei.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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As well as a core of emission on top of the optical galaxy, NGC 4839 has a 2-arc-minute X-ray tail that stretches away from the cluster center.
Coma cluster: x-ray archaeology

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