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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.


T. Lu

D.G. Gilbank

M.L. Balogh

M. Milkeraitis

H. Hoekstra

L. van Waerbeke

D.A. Wake

R.G. Bower


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.


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.

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
Keywords Galaxies, Clusters, RX J1347−1145.


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