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http://hdl.handle.net/20.500.12386/24963
Titolo: | A Strong Merger Shock in Abell 665 | Autori: | Dasadia, S. Sun, M. Sarazin, C. Morandi, A. Markevitch, M. Wik, D. Feretti, L. Giovannini, Gabriele GOVONI, FEDERICA VACCA, VALENTINA |
Data pubblicazione: | 2016 | Rivista: | THE ASTROPHYSICAL JOURNAL LETTERS | Numero: | 820 | Fascicolo: | 1 | Da pagina:: | L20 | Abstract: | Deep (103 ks) Chandra observations of Abell 665 have revealed rich structures in this merging galaxy cluster, including a strong shock and two cold fronts. The newly discovered shock has a Mach number of M = 3.0 ± 0.6, propagating in front of a cold disrupted cloud. This makes Abell 665 the second cluster, after the Bullet cluster, where a strong merger shock of M ≈ 3 has been detected. The shock velocity from jump conditions is consistent with (2.7 ± 0.7) × 10<SUP>3</SUP> km s<SUP>-1</SUP>. The new data also reveal a prominent southern cold front with potentially heated gas ahead of it. Abell 665 also hosts a giant radio halo. There is a hint of diffuse radio emission extending to the shock at the north, which needs to be examined with better radio data. This new strong shock provides a great opportunity to study the re-acceleration model with the X-ray and radio data combined. | URI: | http://hdl.handle.net/20.500.12386/24963 | URL: | https://iopscience.iop.org/article/10.3847/2041-8205/820/1/L20 | ISSN: | 2041-8205 | DOI: | 10.3847/2041-8205/820/1/L20 | Bibcode ADS: | 2016ApJ...820L..20D | Fulltext: | open |
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