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A Strong Merger Shock in Abell 665Deep (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 is approximately 3 has been detected. The shock velocity from jump conditions is consistent with (2.7 +/- 0.7) × 10(exp 3) km s(exp −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 reacceleration model with the X-ray and radio data combined.
Document ID
20170002439
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Dasadia, S.
(Alabama Univ. Huntsville, AL, United States)
Sun, M.
(Alabama Univ. Huntsville, AL, United States)
Sarazin, C.
(Virginia Univ. Charlottesville, VA, United States)
Morandi, A.
(Alabama Univ. Huntsville, AL, United States)
Markevitch, M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wik, D.
(Johns Hopkins Univ. Baltimore, MD, United States)
Feretti, L.
(INAF - ORA Bologna, Italy)
Giovannini, G.
(INAF - ORA Bologna, Italy)
Govoni, F.
(INAF - ORA Cagliari, Italy)
Date Acquired
March 23, 2017
Publication Date
March 17, 2016
Publication Information
Publication: The Astrophysical Journal Letters
Publisher: The American Astronomical Society
Volume: 820
Issue: 1
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN40210
Funding Number(s)
CONTRACT_GRANT: GO1-12169X
WBS: WBS 662144
CONTRACT_GRANT: NAS8-03060
CONTRACT_GRANT: GO4-15123X
CONTRACT_GRANT: NNX14AB76A
CONTRACT_GRANT: GO2-13102A
CONTRACT_GRANT: GO2-13160A
Distribution Limits
Public
Copyright
Other
Keywords
galaxies: clusters: general- galaxies: clisters; individual (Abell 665) - radio

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