Large-scale structure and dynamics of the most X-ray luminous galaxy cluster known - RX J1347−1145

Lu, Ting; Gilbank, David G.; Balogh, Michael L.; Milkeraitis, Martha; Hoekstra, Henk; Van Waerbeke, Ludovic; Wake, David A.; Edge, Alastair C. and Bower, Richard G. (2010). Large-scale structure and dynamics of the most X-ray luminous galaxy cluster known - RX J1347−1145. Monthly Notices of the Royal Astronomical Society, 403(4) pp. 1787–1800.

DOI: https://doi.org/10.1111/j.1365-2966.2010.16245.x

Abstract

We present photometric, spectroscopic and weak lensing analysis of the large-scale structure and dynamics of the most X-ray luminous galaxy cluster known, RXJ1347−1145, at z=0.451. We spectroscopically confirmed 47 new members with Low Dispersion Survey Spectrograph 3 (LDSS3) on the Magellan telescope. Together with previously known members, we measure a new velocity dispersion of 1163 ± 97 km s⁻¹. The mass inferred from our velocity dispersion is M₂₀₀ = 1.16^+0.32_−0.27 × 10¹⁵M_⊙ with r₂₀₀ = 1.85 Mpc, under the assumption of a singular isothermal sphere. We also present a weak lensing analysis using deep Canada–France–Hawaii Telescope (CFHT) data on this cluster, and find a deprojected mass of 1.47^+0.46_−0.43 × 10¹⁵M_⊙ within r₂₀₀, in excellent agreement with our dynamical estimate. Thus, our new dynamical mass estimate is consistent with that from weak lensing and X-ray studies in the literature, resolving a previously claimed discrepancy. We photometrically detect and spectroscopically confirm another massive cluster with σ = 780 ± 100 km s⁻¹ and M₂₀₀ = 3.4^+1.4_−1.1 × 10¹⁴M_⊙ ~ 7 Mpc south-west of RX J1347−1145, which we refer to as RXJ1347−SW. Our spectroscopic survey reveals a possible excess of galaxies in velocity space in the region between RX J1347−1145 and RXJ1347−SW; comparing with simulations, this excess appears consistent with that expected from a large filamentary structure traced by galaxies connecting these two clusters.

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About

• Item ORO ID
• 38420
• Item Type
• Journal Item
• ISSN
• 1365-2966
• Keywords
• galaxies; clusters
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2010 The Authors
• Depositing User
• Astrid Peterkin