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Clerc, N; Merloni, A; Zhang, Y-Y; Finoguenov, A; Dwelly, T; Nandra, K; Collins, C; Dawson, K; Kneib, J-P; Rozo, E; Rykoff, E; Sadibekova, T; Brownstein, J; Lin, Y-T; Ridl, J; Salvato, M; Schwope, A; Steinmetz, M; Seo, H-J; Tinker, J
Monthly Notices of the Royal Astronomical Society, 12/2016, Letnik: 463, Številka: 4Journal Article
SPIDERS (The SPectroscopic IDentification of eROSITA Sources) is a programme dedicated to the homogeneous and complete spectroscopic follow-up of X-ray active galactic nuclei and galaxy clusters over a large area (~7500 deg super( 2)) of the extragalactic sky. SPIDERS is part of the Sloan Digital Sky Survey (SDSS)-IV project, together with the Extended Baryon Oscillation Spectroscopic Survey and the Time-Domain Spectroscopic Survey. This paper describes the largest project within SPIDERS before the launch of eROSITA: an optical spectroscopic survey of X-ray-selected, massive (~10 super( 14)-10 super( 15) M...) galaxy clusters discovered in ROSAT and XMM-Newton imaging. The immediate aim is to determine precise (... ~ 0.001) redshifts for 4000-5000 of these systems out to z ~ 0.6. The scientific goal of the program is precision cosmology, using clusters as probes of large-scale structure in the expanding Universe. We present the cluster samples, target selection algorithms and observation strategies. We demonstrate the efficiency of selecting targets using a combination of SDSS imaging data, a robust red-sequence finder and a dedicated prioritization scheme. We describe a set of algorithms and work-flow developed to collate spectra and assign cluster membership, and to deliver catalogues of spectroscopically confirmed clusters. We discuss the relevance of line-of-sight velocity dispersion estimators for the richer systems. We illustrate our techniques by constructing a catalogue of 230 spectroscopically validated clusters (0.031 < z < 0.658), found in pilot observations. We discuss two potential science applications of the SPIDERS sample: the study of the X-ray luminosity-velocity dispersion (L sub( X)-...) relation and the building of stacked phase-space diagrams. (ProQuest: ... denotes formulae/symbols omitted.)
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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