The stripping of a galaxy group diving into the massive cluster A2142
D. Eckert, S. Molendi, M. Owers, M. Gaspari, T. Venturi, L. Rudnick,, S. Ettori, S. Paltani, F. Gastaldello, M. Rossetti

TL;DR
This paper reports the discovery of a galaxy group being accreted into the galaxy cluster Abell 2142, revealing a long X-ray trail and providing insights into structure formation and gas stripping processes.
Contribution
It presents the first detailed observation of a galaxy group being stripped and accreted into a massive cluster, with a focus on the longest X-ray trail observed to date.
Findings
The X-ray trail extends over at least 800 kpc.
The gas temperature is about 1.4 keV, typical of a galaxy group.
The stripped gas has survived over 600 Myr, much longer than expected.
Abstract
Structure formation in the current Universe operates through the accretion of group-scale systems onto massive clusters. The detection and study of such accreting systems is crucial to understand the build-up of the most massive virialized structures we see today. We report the discovery with XMM-Newton of an irregular X-ray substructure in the outskirts of the massive galaxy cluster Abell 2142. The tip of the X-ray emission coincides with a concentration of galaxies. The bulk of the X-ray emission of this substructure appears to be lagging behind the galaxies and extends over a projected scale of at least 800 kpc. The temperature of the gas in this region is 1.4 keV, which is a factor of ~4 lower than the surrounding medium and is typical of the virialized plasma of a galaxy group with a mass of a few 10^13M_sun. For this reason, we interpret this structure as a galaxy group in the…
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