Kavli Affiliate: Eric Miller
| Summary:
We present the results of a deep 251 ks XRISM/Resolve observation of the cool core of the galaxy cluster Abell 2199. From the integrated spectrum of the central $3′ times 3’$ Resolve field of view ($104 times 104 mathrm~kpc^2$), we find that the intracluster medium (ICM) redshift is consistent with that of the brightest cluster galaxy, within the optical-redshift uncertainty. This indicates that they form a kinematically coherent core system, which offset from the mean cluster redshift by $sim200~mathrmkm~s^-1$. The observed velocity dispersion of $sim100~mathrmkm~s^-1$ corresponds to a three-dimensional Mach number of $M_mathrm3D=0.16$ and a non-thermal pressure fraction of $P_mathrmNT/P_mathrmtot=1.4pm0.2$%. Abell 2199 is one of the most dynamically quiescent relaxed clusters observed with XRISM, despite the presence of radio jets and a plume-like structure possibly associated with sloshing motions. Order-of-magnitude estimates suggest that turbulent dissipation could offset a non-negligible fraction of the radiative cooling losses, with $Q_mathrmturb/Q_mathrmcoolapprox0.2$ for a large-scale driver such as sloshing and larger values for smaller AGN-feedback scales. Finally, we detect a localized enhancement of the Fe XXV He$α$ $y$ line in the southeast region, which spatially coincides with a Chandra surface brightness discontinuity.
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