Image Details
Caption: Fig. 16.
DPOSS F‐plate images of four rich clusters. Two were not previously known, and two (NSC 172013+264028 = RXC J1720.1+2637 and NSC 122906+473720 = RXC J1229.0+4737) were detected only as X‐ray clusters.
© 2003. The American Astronomical Society. All rights reserved. Printed in U.S.A.