Spectroscopy of moderately high-redshift RCS-1 clusters

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dc.creatorGilbank, David G.
dc.creatorYee, H. K. C.
dc.creatorEllingson, E.
dc.creatorGladders, M. D.
dc.creatorBarrientos, L. F.
dc.creatorBlindert, K.
dc.date2007-05-07
dc.date.accessioned2026-07-07T11:20:31Z
dc.date.available2026-07-07T11:20:31Z
dc.descriptionWe present spectroscopic observations of 11 moderately high-redshift (z~0.7- 1.0) clusters from the first Red-Sequence Cluster Survey (RCS-1). We find excellent agreement between the red-sequence estimated redshift and the spectroscopic redshift, with a scatter of 10% at z>0.7. At the high-redshift end (z>~0.9) of the sample, we find two of the systems selected are projections of pairs of comparably rich systems, with red-sequences too close to discriminate in (R-z') colour. In one of these systems, the two components are close enough to be physically associated. For a subsample of clusters with sufficient spectroscopic members, we examine the correlation between B_gcR (optical richness) and the dynamical mass inferred from the velocity dispersion. We find these measurements to be compatible, within the relatively large uncertainties, with the correlation established at lower redshift for the X-ray selected CNOC1 clusters and also for a lower redshift sample of RCS-1 clusters. Confirmation of this and calibration of the scatter in the relation will require larger samples of clusters at these and higher redshifts. [abridged]
dc.descriptionAJ accepted. 30 pages, 7 figures (figure 5 reduced quality)
dc.identifierhttps://arxiv.org/abs/0705.0782
dc.identifierhttp://arxiv.org/abs/0705.0782
dc.identifierAstron.J.134:282-293,2007
dc.identifierdoi:10.1086/518561
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193985
dc.subjectAstrophysics
dc.titleSpectroscopy of moderately high-redshift RCS-1 clusters
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