Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.514g&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
In very recent years several clusters at high redshift (z > 0.75) have been discovered through their X-ray emission in different X-ray surveys. Follow-up observations with X-ray telescopes, and deep imaging from the ground and from HST, have shown that massive bound structures are not as rare as was once believed. Weak lensing techniques applied these X-ray seleced clusters have provided masses of the order of several 1014 or 1015 solar masses. We will report on results of these distant objects, some of them presenting a filamentary structure in the optical. These objects are of special importance because their X-ray emission and weak lensing signals imply that they are massive, comparable to low redshift examples, and their existence is problematic for some theories of structure formation.
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