Simulating nearly edge-on sloshing in the galaxy cluster Abell 2199

Abstract

Off-axis collisions between galaxy clusters may induce the phenomenon of sloshing, causing dense gas to be dragged from the cool core of a cluster, resulting in a spiral of enhanced Xray emission. Abell 2199 displays signatures of sloshing in its core and it is possible that the orbital plane of the collision is seen nearly edge-on. We aim to evaluate whether the features of Abell 2199 can be explained by a sloshing spiral seen under a large inclination angle.To address this, we perform tailored hydrodynamical N-body simulations of a non-frontal collision with a galaxy group of M 200 = 1.6 × 10 13 M . We obtain a suitable scenario in which the group passed by the main cluster core 0.8 Gyr ago, with a pericentric separation of 292 kpc. Good agreement is obtained from the temperature maps as well as the residuals from a β-model fit to the simulated X-ray emission. We find that under an inclination of i = 70 • the simulation results remain consistent with the observations.

A major galaxy cluster merger caught by eROSITA: weak lensing mass distribution and kinematic description

“…Fischer et al 2021), even if they are observed at late stages of a merger (e.g., Tam et al 2020). As the ICM carries the most discernible signatures of the merger process (such as shock waves, cold fronts, and sloshing; e.g., Ha et al 2018;Pandge et al 2019;Ueda et al 2020Ueda et al , 2021Cho et al 2021;Machado et al 2022), ongoing high-quality X-ray surveys as the extended ROentgen Survey with an Imaging Telescope Array (eROSITA; Merloni et al 2012;Predehl et al 2021) will dramatically increase the number of identified cluster mergers.…”