XRISM velocity maps of Abell 3571 show subsonic gas motions and thermodynamic asymmetry consistent with early-phase sloshing from an off-axis minor merger with Abell 3572 as candidate perturber.
Bulk and turbulent gas motions in the interacting galaxy cluster Abell 3395 South observed with XRISM
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abstract
We investigate the gas motions in the core region of the Abell~3395 South subcluster (A3395S) using high-resolution X-ray spectroscopy with XRISM/Resolve. By analyzing the Fe~XXV He$\alpha$ emission line, we directly measure the line-of-sight bulk and turbulent velocities of the intracluster medium. We find that the one-dimensional turbulent velocity is low, at the level of $124\pm21~{\rm km\,s^{-1}}$, while a significant line-of-sight bulk velocity of $263\pm23~{\rm km\,s^{-1}}$ is detected. The coexistence of low turbulence and finite bulk motion suggests that A3395S has not yet reached a dynamically relaxed state. These results are consistent with the non-detection of a radio halo in A3395S, implying that turbulent particle reacceleration is currently inefficient in the cluster core. This study demonstrates that high-resolution X-ray spectroscopy with XRISM provides a powerful means to directly constrain intracluster medium dynamics in merging galaxy clusters, and it provides a reference for future comparative studies of A3395N and A3391 within the same large-scale structure.
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2026 4representative citing papers
XRISM observations of 19 galaxy clusters reveal that disturbed systems are distinguished from relaxed cool cores by coherent bulk motions (R_v > 1) rather than simply higher velocity dispersions.
XRISM Resolve measures the lowest turbulent velocity yet in a cluster core, indicating Abell 496 is dynamically quiescent despite prior cold fronts and weak radio activity.
A grid of 434 Faraday rotation measures from MeerKAT polarimetry reveals enhanced RM scatter in the Abell 3391/95 clusters and suggests a relatively ordered magnetic field in the intercluster bridge on ~10 kpc scales.
citing papers explorer
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Sloshing Motions in Abell 3571 Revealed by XRISM/Resolve Velocity Mapping
XRISM velocity maps of Abell 3571 show subsonic gas motions and thermodynamic asymmetry consistent with early-phase sloshing from an off-axis minor merger with Abell 3572 as candidate perturber.
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Kinetic structure of the intracluster medium across nearby clusters observed with XRISM
XRISM observations of 19 galaxy clusters reveal that disturbed systems are distinguished from relaxed cool cores by coherent bulk motions (R_v > 1) rather than simply higher velocity dispersions.
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The Quiescent Sloshing Core of Abell 496 with XRISM
XRISM Resolve measures the lowest turbulent velocity yet in a cluster core, indicating Abell 496 is dynamically quiescent despite prior cold fronts and weak radio activity.
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Magnetic properties of the Abell 3391-3395 system revealed using wide-field MeerKAT polarimetry
A grid of 434 Faraday rotation measures from MeerKAT polarimetry reveals enhanced RM scatter in the Abell 3391/95 clusters and suggests a relatively ordered magnetic field in the intercluster bridge on ~10 kpc scales.