Kavli Affiliate: Erin Kara
| First 5 Authors: XRISM Collaboration, XRISM Collaboration, , ,
| Summary:
We present results from XRISM/Resolve observations of the core of the galaxy
cluster Abell 2319, focusing on its kinematic properties. The intracluster
medium (ICM) exhibits temperatures of approximately 8 keV across the core, with
a prominent cold front and a high-temperature region ($sim$11 keV) in the
northwest. The average gas velocity in the 3 arcmin $times$ 4 arcmin region
around the brightest cluster galaxy (BCG) covered by two Resolve pointings is
consistent with that of the BCG to within 40 km s$^-1$ and we found modest
average velocity dispersion of 230-250 km s$^-1$. On the other hand,
spatially-resolved spectroscopy reveals interesting variations. A blueshift of
up to $sim$230 km s$^-1$ is observed around the east edge of the cold front,
where the gas with the lowest specific entropy is found. The region further
south inside the cold front shows only a small velocity difference from the
BCG; however, its velocity dispersion is enhanced to 400 km s$^-1$, implying
the development of turbulence. These characteristics indicate that we are
observing sloshing motion with some inclination angle following BCG and that
gas phases with different specific entropy participate in sloshing with their
own velocities, as expected from simulations. No significant evidence for a
high-redshift ICM component associated with the subcluster Abell 2319B was
found in the region covered by the current Resolve pointings. These results
highlight the importance of sloshing and turbulence in shaping the internal
structure of Abell 2319. Further deep observations are necessary to better
understand the mixing and turbulent processes within the cluster.
| Search Query: ArXiv Query: search_query=au:”Erin Kara”&id_list=&start=0&max_results=3