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http://hdl.handle.net/20.500.12386/32360
Titolo: | Chandra and XMM-Newton observations of A2256: cold fronts, merger shocks, and constraint on the IC emission | Autori: | Ge, Chong Liu, Ruo-Yu Sun, Ming Yu, Heng Rudnick, Lawrence Eilek, Jean Owen, Frazer Dasadia, Sarthak ROSSETTI, MARIACHIARA Markevitch, Maxim Clarke, Tracy E. Jones, Thomas W. GHIZZARDI, SIMONA VENTURI, Tiziana Finoguenov, Alexis Eckert, Dominique |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 497 | Fascicolo: | 4 | Da pagina:: | 4704 | Abstract: | We present the results of deep Chandra and XMM-Newton observations of a complex merging galaxy cluster Abell 2256 (A2256) that hosts a spectacular radio relic (RR). The temperature and metallicity maps show clear evidence of a merger between the western subcluster (SC) and the primary cluster (PC). We detect five X-ray surface brightness edges. Three of them near the cluster centre are cold fronts (CFs): CF1 is associated with the infalling SC; CF2 is located in the east of the PC; and CF3 is located to the west of the PC core. The other two edges at cluster outskirts are shock fronts (SFs): SF1 near the RR in the NW has Mach numbers derived from the temperature and the density jumps, respectively, of M<SUB>T</SUB> = 1.62 ± 0.12 and M<SUB>ρ</SUB> = 1.23 ± 0.06; SF2 in the SE has M<SUB>T</SUB> = 1.54 ± 0.05 and M<SUB>ρ</SUB> = 1.16 ± 0.13. In the region of the RR, there is no evidence for the correlation between X-ray and radio substructures, from which we estimate an upper limit for the inverse-Compton emission, and therefore set a lower limit on the magnetic field (˜ 450 kpc from PC centre) of B > 1.0 μG for a single power-law electron spectrum or B > 0.4 μG for a broken power-law electron spectrum. We propose a merger scenario including a PC, an SC, and a group. Our merger scenario accounts for the X-ray edges, diffuse radio features, and galaxy kinematics, as well as projection effects. | URI: | http://hdl.handle.net/20.500.12386/32360 | URL: | https://academic.oup.com/mnras/article/497/4/4704/5892576 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa2320 | Bibcode ADS: | 2020MNRAS.497.4704G | Fulltext: | open |
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