optical galaxy

optical galaxy

[′äp·tə·kəl ′gal·ik·sē]
(astronomy)
One of the galaxies that appear as nearly starlike, generally having compact nuclei.
References in periodicals archive ?
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.