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Constraints on cold dark matter theories from observations of massive x-ray-luminous clusters of galaxies at high redshiftDuring the course of a gravitational lensing survey of distant, X-ray selected Einstein Observatory Extended Medium Sensitivity Survey (EMSS) clusters of galaxies, we have studied six X-ray-luminous (L(sub x) greater than 5 x 10(exp 44)(h(sub 50)(exp -2))ergs/sec) clusters at redshifts exceeding z = 0.5. All of these clusters are apparently massive. In addition to their high X-ray luminosity, two of the clusters at z approximately 0.6 exhibit gravitationally lensed arcs. Furthermore, the highest redshift cluster in our sample, MS 1054-0321 at z = 0.826, is both extremely X-ray luminous (L(sub 0.3-3.5keV)=9.3 x 10(exp 44)(h(sub 50)(exp -2))ergs/sec) and exceedingly rich with an optical richness comparable to an Abell Richness Class 4 cluster. In this Letter, we discuss the cosmological implications of the very existence of these clusters for hierarchical structure formation theories such as standard Omega = 1 CDM (cold dark matter), hybrid Omega = 1 C + HDM (hot dark matter), and flat, low-density Lambda + CDM models.
Document ID
19950056290
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Luppino, G. A. (University of Hawaii, Honolulu, Hawaii United States)
Gioia, I. M. (University of Hawaii, Honolulu, Hawaii United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1995
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 445
Issue: 2
ISSN: 0004-637X
Subject Category
ASTRONOMY
Funding Number(s)
CONTRACT_GRANT: NAG5-1752
CONTRACT_GRANT: NSF AST-91-19216
CONTRACT_GRANT: NAG5-1880
CONTRACT_GRANT: NAG5-2594
Distribution Limits
Public
Copyright
Other