Strong and Weak Lensing United. III. Measuring the Mass Distribution of the Merging Galaxy Cluster 1ES 0657-558
Abstract
The galaxy cluster 1ES 0657-558 (z=0.296) is remarkably well suited for addressing outstanding issues in both galaxy evolution and fundamental physics. We present a reconstruction of the mass distribution from both strong and weak gravitational lensing data. Multicolor, high-resolution HST ACS images allow detection of many more arc candidates than were previously known, especially around the subcluster. Using the known redshift of one of the multiply imaged systems, we determine the remaining source redshifts using the predictive power of the strong-lens model. Combining this information with shape measurements of ``weakly'' lensed sources, we derive a high-resolution, absolutely calibrated mass map, using no assumptions regarding the physical properties of the underlying cluster potential. This map provides the best available quantification of the total mass of the central part of the cluster. We also confirm the result from Clowe and colleagues that the total mass does not trace the baryonic mass.
Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. These observations are associated with program 10200. This work is also based in part on observations made with the Spitzer Space Telescope and with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Spitzer is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.- Publication:
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The Astrophysical Journal
- Pub Date:
- December 2006
- DOI:
- 10.1086/508601
- arXiv:
- arXiv:astro-ph/0608408
- Bibcode:
- 2006ApJ...652..937B
- Keywords:
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- Cosmology: Dark Matter;
- Galaxies: Clusters: General;
- galaxies: clusters: individual (1ES 0657-558);
- Cosmology: Gravitational Lensing;
- Astrophysics;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Phenomenology
- E-Print:
- Accepted for publication in ApJ