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 has been detected. The shock velocity from jump conditions is consistent with (2.7 ±0.7) x103 km s-1. 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.
Dasadia, S., Sun, M., Sarazin, C., Morandi, A., Markevitch, M., Wik, D., et al. (2016). A STRONG MERGER SHOCK in ABELL 665. THE ASTROPHYSICAL JOURNAL LETTERS, 820(1), 1-5 [10.3847/2041-8205/820/1/L20].
A STRONG MERGER SHOCK in ABELL 665
GIOVANNINI, GABRIELE;
2016
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 has been detected. The shock velocity from jump conditions is consistent with (2.7 ±0.7) x103 km s-1. 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
