Journal Article

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

Ting Lu, David G. Gilbank, Michael L. Balogh, Martha Milkeraitis, Henk Hoekstra, Ludovic Van Waerbeke, David A. Wake, Alastair C. Edge and Richard G. Bower

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 403, issue 4, pages 1787-1800
Published in print April 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16245.x
Large-scale structure and dynamics of the most X-ray luminous galaxy cluster known – RX J1347−1145

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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, RX J1347−1145, 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× 1015 M, 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× 1015 M 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× 1014 M∼ 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.

Keywords: galaxies: clusters: general; galaxies: clusters: individual: RX J1347−1145

Journal Article.  10113 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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