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  • 1711.01347v1

    Rights statement: © 2019. The American Astronomical Society. All rights reserved.

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Merging Cluster Collaboration: Optical and Spectroscopic Survey of a Radio-Selected Sample of Twenty Nine Merging Galaxy Clusters

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  • Nathan Golovich
  • William A. Dawson
  • David M. Wittman
  • Myungkook J. Jee
  • Bryant Benson
  • Brian Lemaux
  • Reinout J. van Weeren
  • Felipe Andrade-Santos
  • David Sobral
  • Francesco de Gasperin
  • Marcus Bruggen
  • Marusa Bradac
  • Kyle Finner
  • Annika Peter
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Article number39
<mark>Journal publication date</mark>18/02/2019
<mark>Journal</mark>The Astrophysical Journal Supplement Series
Issue number2
Volume240
Number of pages14
Publication statusPublished
Original languageEnglish

Abstract

Multi-band photometric and multi-object spectroscopic surveys of merging galaxy clusters allow for the characterization of the distributions of constituent dark matter and galaxy populations, constraints on the dynamics of the merging subclusters, and an understanding of galaxy evolution of member galaxies. We present deep photometric observations from Subaru/SuprimeCam and a catalog of $\sim$5400 spectroscopic cluster members from Keck/DEIMOS across 29 merging galaxy clusters ranging in redshift from $z=0.07$ to $0.55$. The ensemble is compiled based on the presence of radio relics, which highlight cluster scale collisionless shocks in the intra-cluster medium. Together with the spectroscopic and photometric information, the velocities, timescales, and geometries of the respective merging events may be tightly constrained. In this preliminary analysis, the velocity distributions of 28 of the 29 clusters are shown to be well fit by single Gaussians. This indicates that radio relic mergers largely occur transverse to the line of sight and/or near apocenter. In this paper, we present our optical and spectroscopic surveys, preliminary results, and a discussion of the value of radio relic mergers for developing accurate dynamical models of each system.

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© 2019. The American Astronomical Society. All rights reserved.