A New X-Ray--Discovered Cluster of Galaxies Associated with CL0016+16
Abstract
We have discovered a new cluster of galaxies, RX J0018.3+1618, in a deep ROSAT PSPC pointing of the distant cluster CL0016+16. The X-ray flux of the new cluster is 8 times 10(-14) ergs s(-1) cm(-2) in the 0.2--2 keV band, which is about 10% of the X-ray flux of CL0016+16. We carried out optical spectroscopy at the Multiple Mirror Telescope and measured the redshifts of 10 galaxies in the direction of RX J0018.3+1618. Eight galaxies lie at a redshift of ~ 0.55. The difference in mean radial velocity between the new cluster (z=0.5498) and CL0016+16 (z=0.5455) is comparable to the internal velocity dispersions of the clusters. The angular separation between them is 10(') corresponding to a linear distance of 4.4 Mpc for a Hubble constant of 50 km s(-1) Mpc(-1) and q_0 = 0.5. We investigate the likelihood that these clusters are bound and speculate on the implications of this discovery for models of large scale structure.
- Publication:
-
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 1994
- Bibcode:
- 1994AAS...185.7413H