Radio relics tracing the projected mass distribution in CIZA J2242.8+5301

16Citations
Citations of this article
13Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

We present a weak-lensing analysis for a merging galaxy cluster, CIZA J2242.8+5301, which hosts double radio relics, using three-b and Subaru/Suprime-Cam imaging (Br′z′). Since the lifetime of dark matter halos colliding into clusters is longer than that of X-ray emitting gas halos, weak-lensing analysis is a powerful method to constrain merger dynamics. Two-dimensional shear fitting using a clean background catalog suggests that the cluster undergoes a merger with a mass ratio of about 2: 1. The main halo is located around the gas core in the southern region, while no concentrated gas core is associated with the northern sub-halo. We find that the projected cluster mass distribution resulting from an unequal-mass merger is in excellent agreement with the curved shapes of the two radio relics and the overall X-ray morphology, except for the lack of the northern gas core. The lack of a prominent radio halo enables us to constrain an upper limit of the fractional energy of magnetohydrodynamic turbulence of (δ B/B)2< O(10-6) at a resonant wavenumber, by finding a balance between the acceleration time and the time after the core passage or the cooling time, with an assumption of resonant acceleration by a second-order Fermi process.

Cite

CITATION STYLE

APA

Okabe, N., Akamatsu, H., Kakuwa, J., Fujita, Y., Zhang, Y., Tanaka, M., & Umetsu, K. (2015). Radio relics tracing the projected mass distribution in CIZA J2242.8+5301. Publications of the Astronomical Society of Japan, 67(6). https://doi.org/10.1093/pasj/psv085

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free