The Mass distribution of the Most Luminous X-ray Cluster RXJ1347.5-1145 from Gravitational Lensing

Philippe Fischer; J. Anthony Tyson

doi:10.1086/118447

paper

The Mass distribution of the Most Luminous X-ray Cluster RXJ1347.5-1145 from Gravitational Lensing

arXiv:astro-ph/9703189 · doi:10.1086/118447

Abstract

Galaxy cluster mass distribution are potentially useful probes of $Ω_{0}$ and the nature of the dark matter. Large clusters will distort the observed shapes of background galaxies through gravitational lensing allowing the measurement of the cluster mass distributions. In this paper we describe weak statistical lensing measurements of the most luminous X-ray cluster known, RXJ1347.5-1145 at z=0.45. We detect a shear signal in the background galaxies at a signal-to-noise ratio of 7.5 in the radial range $120 \leq r \leq 1360 h^{- 1}$ kpc. A mass map of the cluster reveals an 11 $σ$ peak in the cluster mass distribution consistent with the position of the central dominant galaxy and 3 $σ$ evidence for the presence of a subcluster at a projected radius of 1.3 - 1.7 h^{-1} Mpc from the cluster center. In the range $120 \leq r \leq 1360 h^{- 1}$ kpc mass traces light, and the azimuthally averaged cluster mass and light profiles are consistent with singular isothermal spheres with M(r<1 Mpc) = $1.7 \pm 0.4 \times 1 0^{15} M_{⊙}$ . Assuming an isotropic velocity distribution function, the implied velocity dispersion is $σ = 1500 \pm 160 k m s^{- 1}$ . The rest-frame mass-to-light ratio is $M / L_{B} = 200 \pm 50 h M_{⊙} / L_{B ⊙}$ . The lensing mass estimate is almost twice as high as a previously determined X-ray mass estimate.

21 Pages LaTeX, AASTEX version 4 macros, Accepted for publication in the AJ. 8 of 12 figures included, full paper at http://www.astro.lsa.umich.edu:80/users/philf/www/papers/list.html

The Mass distribution of the Most Luminous X-ray Cluster RXJ1347.5-1145 from Gravitational Lensing

Abstract

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