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http://hdl.handle.net/20.500.12386/30467
Title: | Evidence for a Merger-induced Shock Wave in ZwCl 0008.8+5215 with Chandra and Suzaku | Authors: | Di Gennaro, G. van Weeren, R. J. Andrade-Santos, F. Akamatsu, H. Randall, S. W. Forman, W. Kraft, R. P. BRUNETTI, GIANFRANCO Dawson, W. A. Golovich, N. Jones, C. |
Issue Date: | 2019 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 873 | Issue: | 1 | First Page: | 64 | Abstract: | We present the results from new deep Chandra (∼410 ks) and Suzaku (∼180 ks) observations of the merging galaxy cluster ZwCl 0008.8+5215 (z = 0.104). Previous radio observations revealed the presence of a double radio relic located diametrically west and east of the cluster center. Using our new Chandra data, we find evidence for the presence of a shock at the location of the western relic, RW, with a Mach number {{ \mathcal M }}{SX}={1.48}-0.32+0.50 from the density jump. We also measure {{ \mathcal M }}{TX}={2.35}-0.55+0.74 and {{ \mathcal M }}{TX}={2.02}-0.47+0.74 from the temperature jump, with Chandra and Suzaku, respectively. These values are consistent with the Mach number estimate from a previous study of the radio spectral index, under the assumption of diffusive shock acceleration ({{ \mathcal M }}RW}={2.4}-0.2+0.4). Interestingly, the western radio relic does not entirely trace the X-ray shock. A possible explanation is that the relic traces fossil plasma from nearby radio galaxies that is reaccelerated at the shock. For the eastern relic we do not detect an X-ray surface brightness discontinuity, despite the fact that radio observations suggest a shock with {{ \mathcal M }}RE}={2.2}-0.1+0.2. The low surface brightness and reduced integration time for this region might have prevented the detection. The Chandra surface brightness profile suggests { \mathcal M }≲ 1.5, while the Suzaku temperature measurements found {{ \mathcal M }}{TX}={1.54}-0.47+0.65. Finally, we also detect a merger-induced cold front on the western side of the cluster, behind the shock that traces the western relic. | URI: | http://hdl.handle.net/20.500.12386/30467 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab03cd | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab03cd | Bibcode ADS: | 2019ApJ...873...64D | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Di_Gennaro_2019_ApJ_873_64.pdf | Pdf editoriale | 3.93 MB | Adobe PDF | View/Open |
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