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, Richard G. Bower

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21 Scopus citations

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, 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.

Original languageEnglish
Pages (from-to)1787-1800
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume403
Issue number4
DOIs
StatePublished - Apr 2010

Keywords

  • Galaxies: clusters: general
  • Galaxies: clusters: individual: RX J1347-1145

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