Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-11-14
Astronomy and Astrophysics
Astrophysics
10 pages, including 4 postscripts figs, LaTex. To appear in the proceedings of IAU Symposium 187 "Cosmic Chemical Evolution"(h
Scientific paper
Looking for and studying very distant galaxy clusters, clusters at z>1, are one of the prime subjects of the modern observational cosmology. If the metallicity of the hot intra-cluster medium in very distant galaxy clusters is measured for example, it provides fruitful informations for us to understand the formation and evolution of galaxies. However, difficulty of the study is that there is few confirmed very distant galaxy clusters yet. We first have to search for very distant clusters but it requires very deep observations. A random selection of sky is not practical. We have to select the sky. In this article, it is demonstrated that missing lens problem has close connection with very distant cluster of galaxies and dark lens searches could open a new window for studying very distant cluster of galaxies. Firstly, the missing lens problem is summarized and dark lens search is defined. Next, our results for two dark lenses are summarized especially focused on the topics related to the nature of the very distant clusters.
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