Weak-lensing Analysis of the Complex Cluster Merger A746 with Subaru/Hyper Suprime-Cam

The Astrophysical Journal, vol. 962, pp. 100

Abstract

Abstract The galaxy cluster A746 (z = 0.214), featuring a double radio relic system, two isolated radio relics, a possible radio halo, disturbed V-shaped X-ray emission, and intricate galaxy distributions, is a unique and complex merging system. We present a weak-lensing analysis of A746 based on wide-field imaging data from Subaru/Hyper Suprime-Cam observations. The mass distribution is characterized by a main peak, which coincides with the center of the X-ray emission. At this main peak, we detect two extensions toward the north and west tracing the cluster galaxy and X-ray distributions. Despite the ongoing merger, our estimate of the A746 global mass M 500 = 4.4 ± 1.0 × 1014 M ⊙ is consistent with the previous results from Sunyaev-Zel'dovich and X-ray observations. We conclude that reconciling the distributions of mass, galaxies, and intracluster medium with the double radio relic system and other radio features remains challenging.

Authors 18

1. Kim HyeongHan

   Yonsei University

   Affiliation as printed

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea; ahrtears54@yonsei.ac.kr, mkjee@yonsei.ac.kr

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea

2. Hyejeon Cho

   Yonsei University

   Affiliation as printed

   Center for Galaxy Evolution Research, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea; ahrtears54@yonsei.ac.kr, mkjee@yonsei.ac.kr

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea

3. M. James Jee corresponding

   Yonsei University · University of California, Davis

   Affiliation as printed

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea; ahrtears54@yonsei.ac.kr, mkjee@yonsei.ac.kr

   Department of Physics and Astronomy, University of California Davis, Davis, CA 95616 USA

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea

4. David Wittman

   University of California, Davis

   Affiliation as printed

   Department of Physics and Astronomy, University of California Davis, Davis, CA 95616 USA

5. Sangjun Cha

   Yonsei University

   Affiliation as printed

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea; ahrtears54@yonsei.ac.kr, mkjee@yonsei.ac.kr

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea

6. Wonki Lee

   Yonsei University

   Affiliation as printed

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea; ahrtears54@yonsei.ac.kr, mkjee@yonsei.ac.kr

   Department of Astronomy, Yonsei University, 50 Yonsei-ro, Seoul 03722, Republic of Korea

7. Kyle Finner

   California Institute of Technology · Infrared Processing and Analysis Center

   Affiliation as printed

   IPAC, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125, USA

8. K. Rajpurohit

   Center for Astrophysics Harvard & Smithsonian

   Affiliation as printed

   Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

9. M. Brüggen

   Universität Hamburg

   Affiliation as printed

   Universität Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029, Hamburg, Germany

10. W. Forman

    Center for Astrophysics Harvard & Smithsonian

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

11. Christine J. Jones

    Center for Astrophysics Harvard & Smithsonian

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

12. Reinout J. van Weeren Aachen Leiden Observatory

    Leiden University · Leiden Observatory

    Affiliation as printed

    Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands

13. A. Botteon

    Istituto di Radioastronomia di Bologna · National Institute for Astrophysics

    Affiliation as printed

    INAF–IRA, Via P. Gobetti 101, I-40129 Bologna, Italy

14. L. Lovisari

    Center for Astrophysics Harvard & Smithsonian · National Institute for Astrophysics

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

    INAF-IASF Milano, Via A. Corti 12, I-20133 Milano, Italy

15. Andra Stroe

    Center for Astrophysics Harvard & Smithsonian

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

16. Paola Domínguez-Fernández

    Center for Astrophysics Harvard & Smithsonian

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

17. Ewan O’Sullivan

    Center for Astrophysics Harvard & Smithsonian

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA

18. Jan M. Vrtilek

    Center for Astrophysics Harvard & Smithsonian

    Affiliation as printed

    Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA