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

Lu, T.; Gilbank, D.G.; Balogh, M.L.; Milkeraitis, M.; Hoekstra, H.; van Waerbeke, L.; Wake, D.A.; Edge, A.C.; Bower, R.G.

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.

Citation

Lu, T., Gilbank, D., Balogh, M., Milkeraitis, M., Hoekstra, H., van Waerbeke, L., …Bower, R. (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), 1787-1800. https://doi.org/10.1111/j.1365-2966.2010.16245.x

• Journal Article Type: Article
• Publication Date: Apr 1, 2010
• Deposit Date: Jan 30, 2012
• Publicly Available Date: Aug 21, 2013
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 403
• Issue: 4
• Pages: 1787-1800
• DOI: https://doi.org/10.1111/j.1365-2966.2010.16245.x
• Keywords: Galaxies, Clusters, RX J1347−1145.