MC2: A Deeper Look at ZwCl 2341.1+0000 with Bayesian Galaxy Clustering and Weak Lensing Analyses

Benson, B.; Wittman, D. M.; Golovich, N.; Jee, M. James; van Weeren, R. J.; Dawson, W. A.

doi:10.3847/1538-4357/aa6d66

Title: MC²: A Deeper Look at ZwCl 2341.1+0000 with Bayesian Galaxy Clustering and Weak Lensing Analyses

Journal Article · Tue May 16 00:00:00 EDT 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa6d66· OSTI ID:1430962

^[1];

^[1]; Jee, M. James ^[2];

^[3];

^[4]

Univ. of California, Davis, CA (United States)
Univ. of California, Davis, CA (United States); Yonsei Univ., Seoul (Korea, Republic)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

ZwCl 2341.1+0000, a merging galaxy cluster with disturbed X-ray morphology and widely separated (~3 Mpc) double radio relics, was thought to be an extremely massive (10 - 30 X 10¹⁴M⊙) and complex system with little known about its merger history. We present JVLA 2-4 GHz observations of the cluster, along with new spectroscopy from our Keck/DEIMOS survey, and apply Gaussian Mixture Modeling to the three-dimensional distribution of 227 con rmed cluster galaxies. After adopting the Bayesian Information Criterion to avoid over tting, which we discover can bias total dynamical mass estimates high, we nd that a three-substructure model with a total dynamical mass estimate of 9:39 ± 0:81 X 10¹⁴M⊙ is favored. We also present deep Subaru imaging and perform the rst weak lensing analysis on this system, obtaining a weak lensing mass estimate of 5:57±2:47X10¹⁴M⊙. This is a more robust estimate because it does not depend on the dynamical state of the system, which is disturbed due to the merger. Our results indicate that ZwCl 2341.1+0000 is a multiple merger system comprised of at least three substructures, with the main merger that produced the radio relics occurring near to the plane of the sky, and a younger merger in the North occurring closer to the line of sight. Dynamical modeling of the main merger reproduces observed quantities (relic positions and polarizations, subcluster separation and radial velocity difference), if the merger axis angle of ~10⁺³⁴ _-6 degrees and the collision speed at pericenter is ~1900⁺³⁰⁰ _-200 km/s.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1430962

Report Number(s):: LLNL-JRNL-713817; TRN: US1802930

Journal Information:: The Astrophysical Journal (Online), Vol. 841, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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