Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..470..155m&link_type=abstract
The 9th astrophysics conference: After the dark ages, when galaxies were young (the Universe at 2<Z<5). AIP Conference Proceedi
Astronomy and Astrophysics
Astrophysics
Superclusters, Large-Scale Structure Of The Universe, Observational Cosmology
Scientific paper
The existence of massive virialized objects at high redshifts is not expected in most cosmologies. I discuss the evidence for the existence of massive clusters at z>0.9 and conclude that there is strong evidence that such objects exist at z~1.2. At larger redshifts the evidence is not conclusive. The number and mass of such objects is difficult to estimate at present because of their optical faintness and the limitations of present data x-ray telescopes.
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