cD galaxy


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cD galaxy

See clusters of galaxies; galaxies.

CD galaxy

[¦sē¦dē ′gal·ik·sē]
(astronomy)
A supergiant elliptical galaxy with an extended envelope, the largest known type of galaxy.
References in periodicals archive ?
Other researchers had previously established that a cD galaxy tends to emit visible light pointing toward another cD galaxy -- if the neighboring galaxy resides within 150 million light-years.
And "sure enough, in almost every case," he says, "the radio emission from the [nearby] cD galaxy was indeed strongly aligned with [visible-light emissions] and the cluster in which it was located.