Spectroscopic characterization of galaxy clusters in RCS-1: spectroscopic confirmation, redshift accuracy, and dynamical mass-richness relation
We present follow-up spectroscopic observations of galaxy clusters from the first Red-sequence Cluster Survey (RCS-1). This work focuses on two samples, a lower redshift sample of ∼30 clusters ranging in redshift from z ∼ 0.2–0.6 observed with multiobject spectroscopy (MOS) on 4–6.5-m class telescop...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
09 February 2018
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2018, Volume: 476, Issue: 2, Pages: 1991-2012 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/sty355 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1093/mnras/sty355 Verlag, Volltext: https://academic.oup.com/mnras/article/476/2/1991/4848316 
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| Author Notes: | David G. Gilbank, L. Felipe Barrientos, Erica Ellingson, Kris Blindert, H.K.C. Yee, T. Anguita, M.D. Gladders, P.B. Hall, G. Hertling, L. Infante, R. Yan, M. Carrasco, Cristina Garcia-Vergara, K.S. Dawson, C. Lidman and T. Morokuma |
| Summary: | We present follow-up spectroscopic observations of galaxy clusters from the first Red-sequence Cluster Survey (RCS-1). This work focuses on two samples, a lower redshift sample of ∼30 clusters ranging in redshift from z ∼ 0.2–0.6 observed with multiobject spectroscopy (MOS) on 4–6.5-m class telescopes and a z ∼ 1 sample of ∼10 clusters 8-m class telescope observations. We examine the detection efficiency and redshift accuracy of the now widely used red-sequence technique for selecting clusters via overdensities of red-sequence galaxies. Using both these data and extended samples including previously published RCS-1 spectroscopy and spectroscopic redshifts from SDSS, we find that the red-sequence redshift using simple two-filter cluster photometric redshifts is accurate to σz ≈ 0.035(1 + z) in RCS-1. This accuracy can potentially be improved with better survey photometric calibration. For the lower redshift sample, ∼5 per cent of clusters show some (minor) contamination from secondary systems with the same red-sequence intruding into the measurement aperture of the original cluster. At z ∼ 1, the rate rises to ∼20 per cent. Approximately ten per cent of projections are expected to be serious, where the two components contribute significant numbers of their red-sequence galaxies to another cluster. Finally, we present a preliminary study of the mass–richness calibration using velocity dispersions to probe the dynamical masses of the clusters. We find a relation broadly consistent with that seen in the local universe from the WINGS sample at z ∼ 0.05. |
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| Item Description: | Gesehen am 08.04.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/sty355 |