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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.

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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.

Item Type: Journal Item
Copyright Holders: 2010 The Authors
ISSN: 1365-2966
Keywords: galaxies; clusters
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 38420
Depositing User: Astrid Peterkin
Date Deposited: 23 Sep 2013 09:50
Last Modified: 07 Dec 2018 20:47
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