Wide-Field Weak Lensing by RX J1347-1145
Abstract
We present an analysis of weak-lensing observations for RX J1347-1145 over a 43'×43' field taken in B and R filters on the Blanco 4 m telescope at CTIO. RX J1347-1145 is a massive cluster at redshift z=0.45. Using a population of galaxies with 20<R<26, we detect a weak-lensing signal at the p<0.0005 level, finding best-fit parameters of σv=1400+130-140 km s-1 for a singular isothermal sphere model and r200=3.5+0.8-0.2 Mpc with c=15+64-10 for an NFW model in an Ωm=0.3, ΩΛ=0.7 cosmology. In addition, a mass-to-light ratio M/LR=90+/-20 Msolar/LRsolar was determined. These values are consistent with the previous weak-lensing study of RX J1347-1145 by Fischer & Tyson, giving strong evidence that systemic bias was not introduced by the relatively small field of view in that study. Our best-fit parameter values are also consistent with recent X-ray studies by Allen et al. and Ettori et al. but are not consistent with recent optical velocity dispersion measurements by Cohen & Kneib.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2005
- DOI:
- 10.1086/428891
- arXiv:
- arXiv:astro-ph/0502281
- Bibcode:
- 2005ApJ...625..643K
- Keywords:
-
- Galaxies: Clusters: Individual: Alphanumeric: RX J1347-1145;
- Cosmology: Gravitational Lensing;
- Astrophysics
- E-Print:
- accepted to ApJ, tentative publication 10 May 2005, v624 2