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Title: Photometric and spectroscopic survey of the cluster of galaxies Abell A2218
Author: Le Borgne, J. F.
Pelló i Descayre, Roser
Sanahuja i Parera, Blai
Keywords: Cúmuls de galàxies
Fotometria astronòmica
Clusters of galaxies
Astronomical photometry
Issue Date: 1992
Publisher: EDP Sciences
Abstract: We present new photometric and spectroscopic observations of objects in the field of the cluster of galaxies Abell 2218. The photometric survey, centered on the cluster core, extends to a field of about 4 x 4 arcmin. It was performed in 5 bands (B,g,r,i and z filters). This sample, which includes 729 objects, is about three times larger than the survey made by Butcher and collaborators (Butcher et al., 1983, Butcher and Oemler, 1984) in the same central region of the field. Only 228 objects appear in both catalogues since our survey covers a smaller region. The spectral range covered by our filters is wider and the photometry is much deeper, up to magnitude 27 in r. The spectroscopic survey concerns 66 objects, on a field comparable to that of Butcher and collaborators. From our observations we calculate the mean redshift of the cluster, 0.1756, and its velocity dispersion, 1370 km/s. The spectral types are determined for many galaxies in the sample by comparing their spectra with synthetic ones from Rocca-Volmerange and Guiderdoni (1988).
Note: Reproducció digital del document publicat en format paper, proporcionada per NASA Astrophysics Data System
It is part of: Astronomy and Astrophysics Supplement Series, 1992, vol. 95, núm. 1, p. 87-107.
ISSN: 0365-0138
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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