Revealing Substructures in Abell 1240 with Subaru Weak Gravitational Lensing
Abstract
Abell 1240 belongs to a rare class of merging galaxy clusters with symmetric double radio relics. In order to reconstruct the merging scenario of this interesting system, it is important to map out the dark matter distribution and identify substructures. We present the first weak-lensing analysis of Abell 1240 with Subaru observations after robustly addressing instrumental systematics. Our weak-lensing analysis shows that the dark matter distribution of Abell 1240 is bimodal and mimics the cluster galaxy distribution stretched from north to south and perpendicular to the radio relics. Our mass reconstruction also detects the presence of Abell 1237, which is located ~2 Mpc to the south and is believed to be infalling onto Abell 1240. We measure the cluster mass by assuming that the system follows an NFW profile and compare the results with dynamical estimates. In addition, we present our preliminary merging scenario combining the current weak-lensing results and other observations in the literature.
- Publication:
-
American Astronomical Society Meeting Abstracts #231
- Pub Date:
- January 2018
- Bibcode:
- 2018AAS...23125209C