Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000exun.conf..219r&link_type=abstract
EXPLORING THE UNIVERSE A Festschrift in Honor of R Giacconi . Held October 1997 in Rome, Italy. Edited by H Gursky (Naval Resear
Astronomy and Astrophysics
Astronomy
Scientific paper
I review recent observational progress made in the search for and study of distant galaxy clusters, with particular emphasis on the evolution of the abundance of X-ray clusters out to z ~ 1. The very existence of massive collapsed objects at high redshift challenges theories of structure formation. New deep X-ray surveys are now revealing that the bulk of the population of galaxy clusters is not evolving since at least z ≃ 0.8, with possible mild evolution limited to only the most luminous, presumably most massive systems. Thus far, a well defined sample of high redshift (z ≳ 1) clusters has been difficult to assemble and represents one of the most challenging observational tasks for the next decade. The next generation of X-ray instruments in conjuction with the new imaging and spectroscopic capabilities offered by 8-meter class telescopes will open up a new window on the physical understanding of the evolutionary processes involved.
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