A. Furuzawa, T. Yoshioka and K. Yamashita

Abstract

Most of clusters of galaxy with a cD galaxy in it's center have cool components which have been found from X-ray spectra and/or central excess of X-ray brightness distribution. Recently, it is claimed that the cool component is not connected to the cooling flow, but originated in the cD galaxy. Many cD galaxies which have multiple nuclei have been found in distant clusters rather than nearby clusters. The multiple-nucleus cD galaxy is considered to be in the growing phase to the cD galaxy. If the cool component is originated in the cD galaxy, the cool component in the multiple-nucleus cD galaxy is eliminated due to dynamical mixing. The X-ray observation of clusters with multiple-nucleus cD galaxy will provide us informations of the origin of the cool component.