Abstract
One of the major topics in modern cosmology and astrophysics concerns the present status and the past evolution of clusters of galaxies, as well as the knowledge of their abundance, spatial correlations, morphological content, dynamical status, global properties such as X-ray emission, and their relationship with the local environment. Up to now, large efforts have been made in constructing samples of intermediate redshift clusters from inspection of optical plates or through colour diagrams, but they suffer from biases induced by the limit of optical plates and by evolutionary effects (Butcher & Oemler, 1984). These problems therefore limited the optical selection of clusters to the Abell/ACO catalogues, which are grossly incomplete for z > 0.1 (Scaramella et al., 1991), or to selected areas of a few square degrees for which deeper photometry has been obtained (Postman et al., 1996). Moreover, limited sensitivity of instruments and evolutionary effects also affect X-ray selected cluster samples (Gioia et al., 1990).
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Zanichelli, A. et al. (1998). Clusters of Galaxies at Intermediate Redshifts from the NRAO VLA Sky Survey. In: Bremer, M.N., Jackson, N., Pérez-Fournon, I. (eds) Observational Cosmology. Astrophysics and Space Science Library, vol 226. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5238-9_20
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DOI: https://doi.org/10.1007/978-94-011-5238-9_20
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