A merger shock in Abell 1367

Chong Ge , Ming Sun (1) , Ruo-Yu Liu , Lawrence Rudnick , Craig Sarazin , William Forman , Christine Jones , Hao Chen (2) , Wenhao Liu , Masafumi Yagi , Alessandro Boselli (3) , Matteo Fossati , Giuseppe Gavazzi (4)

1 China Agriculture University Net Center
2 Faculty of Aerospace Engineering [Delft]
3 LAM - Laboratoire d'Astrophysique de Marseille
4 UNIMIB - Università degli Studi di Milano-Bicocca = University of Milano-Bicocca

Multi-wavelength observations show that Abell 1367 (A1367) is a dynamically young cluster, with at least two subclusters merging along the SE-NW direction. With the wide-field XMM-Newton mosaic of A1367, we discover a previously unknown merger shock at the NW edge of the cluster. We estimate the shock Mach number from the density and temperature jumps as $M_{\rho}=1.21\pm0.08$ and $M_T=1.60\pm0.07$, respectively. This shock region also corresponds to a radio relic discovered with the VLA and GBT, which could be produced by the shock re-acceleration of pre-existing seed relativistic electrons. We suggest that some of the seed relativistic electrons originate from late-type, star-forming galaxies in this region.

Domaines: Planète et Univers [physics]; Astrophysique [astro-ph]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]

Chong Ge, Ming Sun, Ruo-Yu Liu, Lawrence Rudnick, Craig Sarazin, et al.. A merger shock in Abell 1367. Monthly Notices of the Royal Astronomical Society: Letters, 2019, 486 (1), pp.L36-L40. ⟨10.1093/mnrasl/slz049⟩. ⟨hal-02347220⟩