Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-01-06
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Submitted to MNRAS, 12 pages, 13 figures
Scientific paper
We studied the ICM of the galaxy cluster CIZA J2242.8+5301 using deep XMM-Newton observations. The cluster hosts a 2-Mpc long, ~50-kpc wide radio relic that has been nicknamed the "Sausage". A counter-relic is also present, along with a faint, extended radio halo. We searched for evidence of shock fronts in the surface brightness, temperature, density, and pressure, and we studied the cluster morphology using power ratios. From the temperature jump across the northern relic, we find evidence for a shock of Mach number of $3.6_{-0.74}^{+3.6}$. The systematic uncertainties on the measurement are large, but if the Mach number is confirmed, it would be the highest ever detected in a galaxy cluster merger. The Mach number derived from the temperature jump is consistent with the Mach number of $4.6_{-0.9}^{+1.3}$ inferred from the radio spectral index. We also find indication of a surface brightness jump at the northern relic. Additionally, we observe ripples in the surface brightness, especially in the direction of the northern relic, which might indicate weaker shocks that do not cause detectable radio relics.
Brüggen Marcus
Croston Judith
Hoeft Matthias
Ogrean Georgiana
Rottgering Huub
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