VizieR Online Data Catalog: ROSAT Brightest Cluster Sample. III. (Crawford+, 1999)

The BCS is comprised of clusters culled from a positional cross-correlation of X-ray sources detected in the RASS with the optical cluster catalogues of Abell and Zwicky, as well as systems detected as extended X-ray sources in the RASS and confirmed as clusters using the Palomar Observatory Sky Survey (POSS) and deep optical CCD imaging (Paper I, Ebeling et al., 1998MNRAS.301..881E). The majority of the optical spectra presented in this paper were acquired during two-week-long runs during 1995 May 03-09 and 1996 December 29 - 1997 January 03. A further six galaxies were observed during service time on 1998 March 16 and 29. The observations were made using the Intermediate Dispersion Spectrograph (IDS) on the INT on La Palma, with the R150V grating on the 235-mm camera to yield an intermediate-resolution spectrum with a dispersion of 6.5Å/pixel. In combination with the TEK3 CCD detector, the spectra covered the observed wavelength range 3300-9500Å with a dispersion of 0.7arcsec/pixel in the spatial direction.

(4 data files).