Shocking features in the merging galaxy cluster RXJ0334.2-0111

Dasadia, Sarthak; Sun, Ming; Morandi, Andrea; Sarazin, Craig; Clarke, Tracy; Nulsen, Paul; Massaro, Francesco; Roediger, Elke; Harris, Dan; Forman, Bill

Abstract

© 2016 The Authors. We present a 66 ks Chandra X-ray observation of the galaxy cluster RXJ0334.2-0111. This deep observation revealed a unique bow shock system associated with a wide angle tail (WAT) radio galaxy and several intriguing substructures. The temperature across the bow shock jumps by a factor of ~1.5 (from 4.1 to 6.2 keV), and is consistent with the Mach numberM= 1.6+ 0.5 -0.3. A second inner surface brightness edge is a cold front that marks the border between infalling subcluster cool core and the intracluster medium of the main cluster. The temperature across the cold front increases from 1.3 +0.3 -0.8 to 6.2 +0.6 -0.6 keV. We find an overpressurized region ~250 kpc east of the cold front that is named 'the eastern extension (EE)'. The EE may be a part of the third subcluster in the ongoing merger. We also find a tail shaped feature that originates near the bow shock and may extend up to a distance of ~1 Mpc. This feature is also likely overpressurized. The luminous FR-I radio galaxy, 3C89, appears to be the cD galaxy of the infalling subcluster. We estimated 3C89's jet power from jet bending and the possible interaction between the X-ray gas and the radio lobes. A comparison between the shock standoff distance and the Mach number for all known shock front/cold front combinations suggests that the core is continuously shrinking in size by stripping.

Citation

Dasadia, S., Sun, M., Morandi, A., Sarazin, C., Clarke, T., Nulsen, P., …Forman, B. (2016). Shocking features in the merging galaxy cluster RXJ0334.2-0111. Monthly notices of the Royal Astronomical Society, 458(1), 681-694. https://doi.org/10.1093/mnras/stw291

• Journal Article Type: Article
• Acceptance Date: Feb 2, 2016
• Online Publication Date: Feb 8, 2016
• Publication Date: Feb 22, 2016
• Deposit Date: Mar 1, 2016
• Publicly Available Date: Mar 1, 2016
• Journal: Monthly notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 458
• Issue: 1
• Pages: 681-694
• DOI: https://doi.org/10.1093/mnras/stw291
• Keywords: Galaxies -- clusters -- individual -- RXJ0334.2-0111, 3C89, Galaxies -- clusters -- intracluster medium, X-rays -- galaxies -- clusters, Galaxies -- jets
• Public URL: https://hull-repository.worktribe.com/output/411723
• Publisher URL: http://mnras.oxfordjournals.org/content/early/2016/02/08/mnras.stw291
• Additional Information: This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.