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XRISM Reveals a Kinematically Coherent Core System of the Nearby Cool-Core Cluster Abell 2199

  • Kazunori Suda
  • Kyoko Matsushita
  • Kosuke Sato
  • Kotaro Fukushima
  • Ming Sun
  • Caroline Kilbourne
  • John A Zuhone
  • Edmund Hodges-Kluck
  • Shogo B Kobayashi
  • Simon Dupourque
  • Daniel R Wik
  • Priyanka Chakraborty
5 more authors
  • Arnab Sarkar
  • Marie Kondo
  • Itsuki Aihara
  • Eric D Miller
  • Francois Mernier
Open at sourcePDFDOICite

Abstract

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' × 3' Resolve field of view (104 × 104 kpc2), 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 is offset from the mean cluster redshift by ∼200 km s−1. The observed velocity dispersion of ∼100 km s−1 corresponds to a three-dimensional Mach number of M3D=0.16 and a non-thermal pressure fraction of PNT/Ptot=1.4±0.2%. 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 Qturb/Qcool≈0.2 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 Heα y line in the southeast region, which spatially coincides with a Chandra surface brightness discontinuity.

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Cite

BibTeXRIS
BibTeX
@misc{suda2026xrism,
  title = {{XRISM Reveals a Kinematically Coherent Core System of the Nearby Cool-Core Cluster Abell 2199}},
  author = {Kazunori Suda and Kyoko Matsushita and Kosuke Sato and Kotaro Fukushima and Ming Sun and Caroline Kilbourne and John A Zuhone and Edmund Hodges-Kluck and Shogo B Kobayashi and Simon Dupourque and Daniel R Wik and Priyanka Chakraborty and Arnab Sarkar and Marie Kondo and Itsuki Aihara and Eric D Miller and Francois Mernier},
  howpublished = {HAL},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2607.06977},
  eprint = {2607.06977},
  archivePrefix = {arXiv},
  url = {https://hal.science/hal-05734264v1},
}
RIS
TY  - UNPB
TI  - XRISM Reveals a Kinematically Coherent Core System of the Nearby Cool-Core Cluster Abell 2199
AU  - Kazunori Suda
AU  - Kyoko Matsushita
AU  - Kosuke Sato
AU  - Kotaro Fukushima
AU  - Ming Sun
AU  - Caroline Kilbourne
AU  - John A Zuhone
AU  - Edmund Hodges-Kluck
AU  - Shogo B Kobayashi
AU  - Simon Dupourque
AU  - Daniel R Wik
AU  - Priyanka Chakraborty
AU  - Arnab Sarkar
AU  - Marie Kondo
AU  - Itsuki Aihara
AU  - Eric D Miller
AU  - Francois Mernier
PY  - 2026
DA  - 2026/09/01
PB  - HAL
DO  - 10.48550/arxiv.2607.06977
UR  - https://hal.science/hal-05734264v1
AB  - 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' × 3' Resolve field of view (104 × 104 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 is offset from the mean cluster redshift by ∼200 km s^−1. The observed velocity dispersion of ∼100 km s^−1 corresponds to a three-dimensional Mach number of M_3D=0.16 and a non-thermal pressure fraction of P_NT/P_tot=1.4±0.2%. 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_turb/Q_cool≈0.2 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 Heα y line in the southeast region, which spatially coincides with a Chandra surface brightness discontinuity.
ER  -