Joint X-Ray and Optical Measurements of the Mass Distribution of the Distant Galaxy Cluster Cl J0152.7-1357
Abstract
We present joint X-ray and optical observations of the high-redshift (z~=0.83) lensing cluster Cl J0152.7-1357 made with the Chandra X-Ray Observatory and the Keck telescope. We confirm the existence of significant substructure at both X-ray and optical wavelengths in the form of two distinct clumps, whose temperatures are 6.6+2.4-1.5 and 5.7+2.9-1.6 keV, respectively. The X-ray surface brightness profiles of the two clumps can be fitted by either a single β-model or an NFW-like profile, the latter giving better fits to the central regions. We find that the X-ray-derived mass of this cluster is in good agreement with independent lensing measurements. While its appearance indicates that the cluster has not reached a dynamical equilibrium state, its X-ray luminosity LX, temperature T, and dynamical mass M are consistent with the well-defined LX-T and M-T relations for low-redshift galaxy clusters, which suggests that the dynamical properties of the clusters have remained almost unchanged since z~0.8.
- Publication:
-
The Astronomical Journal
- Pub Date:
- March 2004
- DOI:
- 10.1086/381949
- arXiv:
- arXiv:astro-ph/0312186
- Bibcode:
- 2004AJ....127.1263H
- Keywords:
-
- Cosmology: Observations;
- Galaxies: Clusters: General;
- galaxies: clusters: individual (Cl J0152.7-1357);
- Cosmology: Gravitational Lensing;
- X-rays: galaxies;
- Astrophysics
- E-Print:
- 32 pages, 14 figures, accepted for publication in AJ