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SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV

Clerc, N and Collins, CA (2016) SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV. Monthly Notices of the Royal Astronomical Society, 463 (4). pp. 4490-4515. ISSN 0035-8711

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Abstract

SPIDERS (The SPectroscopic IDentification of eROSITA Sources) is a program dedicated to the homogeneous and complete spectroscopic follow-up of X-ray AGN and galaxy clusters over a large area (_7500 deg2) of the extragalactic sky. SPIDERS is part of the SDSS-IV project, together with the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) and the Time-Domain Spectroscopic Survey (TDSS). This paper describes the largest project within SPIDERS before the launch of eROSITA: an optical spectroscopic survey of X-ray selected, massive (_ 1014 to 1015 M_) galaxy clusters discovered in ROSAT and XMM-Newton imaging. The immediate aim is to determine precise (_z _ 0:001) redshifts for 4,000{5,000 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 (LX

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Date Deposited: 09 Sep 2016 08:28
Last Modified: 12 Jul 2017 11:02
DOI or Identification number: 10.1093/mnras/stw2214
URI: http://researchonline.ljmu.ac.uk/id/eprint/4106

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