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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Two merging galaxy clusters with very hot shock fronts observed shortly before pericentric passage

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Lagana, T. F. [1] ; Souza, G. S. [1] ; Machado, R. E. G. [2] ; Volert, R. C. [2] ; Lopes, P. A. A. [3]
Total Authors: 5
[1] Univ Cidade Sao Paulo, Univ Cruzeiro do Sul, Nucleo Astrofis, Rua Galvao Bueno 868, BR-01506000 Sao Paulo, SP - Brazil
[2] Univ Tecnol Fed Parana, Dept Acad Fis, Rua Sete Setembro 3165, BR-80230901 Curitiba, Parana - Brazil
[3] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 487, n. 3, p. 3922-3934, AUG 2019.
Web of Science Citations: 0

We present a detailed analysis of two merging clusters, from XMM-Newton X-ray archival data: PLCKESZ G036.7+14.9 (z = 0.15; hereafter 6036) and PLCK G292.5+22.0 (z = 0.30; hereafter G292). We notice that the intracluster medium (ICM) is heated as a result of the merger, and we find evidence for a merger shock in the region between both subcluster haloes. X-ray observations confirm that the shocks in these systems are among the hottest known in the literature. From the ICM analysis of temperature discontinuity, the Mach numbers were determined to be M-G036 = 1.3 +/- 0.1 and M-G292 = 1.47 +/- 0.08 for G036 and G292, respectively. In this paper, for each cluster, we propose a hydrodynamic model for the merger as a whole, compatible with their diffuse X-ray emission and temperature maps. The simulations suggest that both clusters are observed shortly before pericentric passage. Our simulation results indicate that the merger of the G036 system is seen at an inclination of 50 degrees (the angle between the plane of the orbit and the plane of the sky), and merely 50 Myr prior to the pericentric passage. In the case of G292, the subclusters would be merging not far from the plane of the sky (i = 18 degrees) and are observed 150 Myr before the two cores collide, (AU)

FAPESP's process: 09/54006-4 - A computer cluster for the Astronomy Department of the University of São Paulo Institute of Astronomy, Geophysics and Atmospheric Sciences and for the Cruzeiro do Sul University Astrophysics Center
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Multi-user Equipment Program
FAPESP's process: 18/02626-8 - X-ray astronomy: the history of chemical enrichment of groups and clusters of galaxies
Grantee:Tatiana Ferraz Laganá
Support type: Regular Research Grants