We present a 66 ksec 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 keV to 6.2 keV), and is consistent with the Mach number M=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 ICM of the main cluster. The temperature across the cold front increases from 1.3+0.3−0.8 keV 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 stand-off distance and the Mach number for all known shock front/cold front combinations suggests that the core is continuously shrinking in size by stripping.

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

MASSARO, Francesco;
2016-01-01

Abstract

We present a 66 ksec 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 keV to 6.2 keV), and is consistent with the Mach number M=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 ICM of the main cluster. The temperature across the cold front increases from 1.3+0.3−0.8 keV 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 stand-off distance and the Mach number for all known shock front/cold front combinations suggests that the core is continuously shrinking in size by stripping.
2016
458
1
681
694
http://mnras.oxfordjournals.org/content/458/1/681.full.pdf
http://arxiv.org/abs/1602.01094
Galaxies: clusters: individual: 3C89 , Galaxies: clusters: individual: RXJ0334.2-0111 , Galaxies: clusters: intracluster medium , Galaxies: jets , X-rays: galaxies: clusters
Dasadia, Sarthak; Sun, Ming; Morandi, Andrea; Sarazin, Craig; Clarke, Tracy; Nulsen, Paul; Massaro, Francesco; Roediger, Elke; Harris, Dan; Forman, Bill
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1589733
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