J/MNRAS/274/1071 J/MNRAS/274/1071 Edinburgh-Milano cluster redshift survey C A Collins L Guzzo R C Nichol S L Lumsden Mon. Not. R. Astron. Soc. 274 1071 1995 1995MNRAS.274.1071C VII/175 : Edingburgh-Durham Cluster Catalogue (Lumdsen+ 1992) Clusters, galaxy Redshifts catalogs cosmology: observations galaxies: clusters: general galaxies: distances and redshifts large-scale structure of universe surveys In this paper, we present the redshifts of the galaxies and galaxy clusters which form the Edinburgh-Milano (EM) cluster redshift survey. A total of 777 galaxy redshifts have been measured in 94 clusters extracted from the digitized Edinburgh-Durham Cluster Catalogue. We also present the radial velocity dispersions for 37 clusters. Observational and data reduction techniques are discussed in detail, together with the strategy adopted to determine the mean redshift of a cluster and to identify and discard plausible phantom clusters. Some 10 per cent of our clusters show heavy contamination, indicating that projection is a serious problem for optically selected, rich clusters. The median velocity dispersion estimated for a subsample of richness R>=1 clusters is 742+/-63km/s. From a simple comparison with {OMEGA}=1 cold dark matter models of structure formation, these results favour a biasing parameter b=1.6-2.0 and are inconsistent with a bias outside of the range b=1.3-2.5.

EDCC Edingburgh-Durham Cluster Catalogue (EDCC, Cat <VII/175>) cluster identification name --- RAh Right ascension (B1950) h RAm Right ascension (B1950) min RAs Right ascension (B1950) s DE- Declination sign --- DEd Declination (B1950) deg DEm Declination (B1950) arcmin DEs Declination (B1950) arcsec bj Approximate (+/-0.25mag) apparent magnitude of the galaxy in the photographic b, band from the EDSGC mag cz1 Radial velocity determined form Tel1 observations km/s Tel1 Telescope (ESO 3.6m, ESO 2.2m or ATT) --- cz2 Radial velocity determined form Tel2 observations km/s Tel2 Telescope (ESO 3.6m, ESO 2.2m or ATT) --- HV Heliocentric velocity km/s EDDC EDCC cluster identification name --- RAh Right ascension (B1950) (see note 1) h RAm Right ascension (B1950) (see note 1) min RAs Right ascension (B1950) (see note 1) s DE- Declination sign --- DEd Declination (B1950) (see note 1) deg DEm Declination (B1950) (see note 1) arcmin DEs Declination (B1950) (see note 1) arcsec bj Approximate (+/-0.25mag) apparent magnitude of the galaxy in the photographic b, band from the EDSGC. mag cz Heliocentric velocity of each galaxy km/s e_cz Internal redshift error from the cross-correlation routine, described in Section 4.2. km/s Note Note on observations number=1 E: ESO observation A: AAT observation AC: A larger than normal error in the coordinates and magnitude. This is the case for galaxies which are not detected in the EDSGC, e.g. objects merged with other object images in the digitization process. NC: Two galaxies in E178, three in E261, two in E424 and three in E473 do not have a certain identification in our logfiles We prefer therefore not to list any coordinate and magnitude which would be too approximate, although we give the redshift and the information that the object belongs to that cluster. --- EDCC EDCC cluster identification name --- RAh Right ascension (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. (1992MNRAS.258....1L, Cat. <VII/175>). h RAm Right ascension (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. (1992MNRAS.258....1L, Cat. <VII/175>). min RAs Right ascension (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. (1992MNRAS.258....1L, Cat. <VII/175>). s DE- Declination sign --- DEd Declination (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. (1992MNRAS.258....1L, Cat. <VII/175>). deg DEm Declination (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. (1992MNRAS.258....1L, Cat. <VII/175>). arcmin DEs Declination (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. (1992MNRAS.258....1L, Cat. <VII/175>). arcsec Ntot Total number of redshifts taken for each cluster (listed in Table 3) --- Nclus Number of cluster members determined from the deprojection algorithm described in Sect. 5.1 --- cz Mean heliocentric redshift of the galaxy members in each cluster km/s e_cz 1 sigma errors on the mean redshift of each cluster km/s sigma Radial velocity dispersions for clusters with N cluster =>6 km/s E_sigma Error in sigma (upper limit) km/s e_sigma Error in sigma (lower limit) km/s Note 'p' indicates that the cluster has been classified as a projection effect (see Sect. 5.1) --- EDCC EDCC cluster identification name --- RAh Right ascension (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. 1992MNRAS.258....1L, Cat. <VII/175> h RAm Right ascension (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. 1992MNRAS.258....1L, Cat. <VII/175> min RAs Right ascension (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. 1992MNRAS.258....1L, Cat. <VII/175> s DE- Declination sign --- DEd Declination (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. 1992MNRAS.258....1L, Cat. <VII/175> deg DEm Declination (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. 1992MNRAS.258....1L, Cat. <VII/175> arcmin DEs Declination (B1950) number=1 Equatorial coordinates of the cluster centroid, taken from Lumsden et al. 1992MNRAS.258....1L, Cat. <VII/175> arcsec R1 Number of galaxy members between the magnitudes m_3_ and m_3_+2 calculated using an Abell radius of 1h^-1^Mpc --- m10 Magnitude of the 10th brightest galaxy, after background correction, within the 1h^-1^Mpc radius mag RAbell Angular 'reduced Abell radius' calculated using the equivalent of Abell's m_10_ distance estimate --- PA Position angle of the cluster as defined in Martin et al. (1995MNRAS.274..623M) deg Eps [0/1] Eccentricity of the clusters, defined and used in Martin et al. (1995MNRAS.274..623M). --- cz Radial velocity of the cluster km/s n_cz Number of galaxies used to determine cz number=2 For the EM clusters, this is just N cluster (number of cluster members determined from the deprojection algorithm) --- Ref Source of the cluster radial velocity number=3 EM : this study Broadbent 1992 (priv. comm.) Ciardullo et al. (1985ApJ...293...69C) Dalton et al. (1994MNRAS.269..151D, Cat. <J/MNRAS/269/151>) Huchra et al. (1992, Cat. <VII/193>) Huchra (priv. comm.) Loveday (19911, PhD thesis, Univ. Cambridge) Muriel et al. (1990AJ....100..339M) Muriel et al. (1991AJ....101.1997M) Nicholson (1991, PhD thesis, Univ. Edinburgh) Olowin et al. (1988A&AS...73..125O) Peacock (priv. comm.) Peterson et al. (1986MNRAS.221..233P) Postman et al. (1992ApJ...384..404P, Cat. <J/ApJ/384/404>) Teague et al. (1990ApJS...72..715T) --- James Marcout, Patricia Bauer CDS 1997Jan14 UNKNOWN UNKNOWN Prepared via OCR at CDS. J_MNRAS_274_1071.xml