Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.7413h&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #74.13; Bulletin of the American Astronomical Society, Vol. 26, p.1429
Astronomy and Astrophysics
Astronomy
1
Scientific paper
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.
Birkinshaw Mark
Huchra John P.
Hughes John Patrick
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