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A XRISM/Resolve View of the Dynamics in the Hot Gaseous Atmosphere of M87

ContributorsXRISM Collaboration
Published inThe Astrophysical journal, vol. 998, no. 2, 210
Publication date2026-02-20
First online date2026-02-11
Abstract

The XRISM/Resolve microcalorimeter directly measured the gas velocities in the core of the Virgo Cluster, the closest example of active galactic nucleus (AGN) feedback in a cluster. This proximity allows us to resolve the kinematic impact of feedback on scales down to 5 kpc. Our spectral analysis reveals a high velocity dispersion of σ v = 26 2 − 38 + 45 km s −1 near the AGN, which steeply declines to ∼60 km s −1 between 5 and 25 kpc in the northwest direction. The observed line-of-sight bulk velocity in all regions is broadly consistent with the central galaxy, M87, with a mild trend toward blueshifted motions at larger radii. Systematic uncertainties have been carefully assessed and do not affect the measurements. The central velocities, if attributed entirely to isotropic turbulence, correspond to a transonic intracluster medium at sub-6 kpc scales with 3D Mach number 0 . 69 -0.11 +0.14 and a nonthermal pressure fraction of 21 -5 +7 % . Simple models of weak shocks and sound waves and calculations assuming isotropic turbulence both support the hypothesis that the velocity field reflects a mix of shock-driven expansion and turbulence. Compared to other clusters observed by XRISM to date, M87’s central region stands out as the most kinematically disturbed, exhibiting both the highest velocity dispersion and the largest 3D Mach number, concentrated at the smallest physical scales.

Funding
  • DOE ∣ NNSA ∣ Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
  • National Aeronautics and Space Administration [80GSFC21M0002]
  • National Aeronautics and Space Administration [80GSFC24M0006]
  • National Aeronautics and Space Administration [80NSSC20K0733]
  • National Aeronautics and Space Administration [80NSSC18K0978]
  • National Aeronautics and Space Administration [80NSSC20K0883]
  • National Aeronautics and Space Administration [80NSSC20K0737]
  • National Aeronautics and Space Administration [80NSSC24K0678]
  • National Aeronautics and Space Administration [80NSSC18K1684]
  • National Aeronautics and Space Administration [80NSSC23K0650]
  • National Aeronautics and Space Administration [80NNSC22K1922]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23H00121]
  • MEXT ∣ Japan Society for the Promotion of Science [JP22H00158]
  • MEXT ∣ Japan Society for the Promotion of Science [JP22H01268]
  • MEXT ∣ Japan Society for the Promotion of Science [JP22K03624]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23H04899]
  • MEXT ∣ Japan Society for the Promotion of Science [JP21K13963]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24K00638]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24K17105]
  • MEXT ∣ Japan Society for the Promotion of Science [JP21K13958]
  • MEXT ∣ Japan Society for the Promotion of Science [JP21H01095]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23K20850]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24H00253]
  • MEXT ∣ Japan Society for the Promotion of Science [JP21K03615]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24K00677]
  • MEXT ∣ Japan Society for the Promotion of Science [JP20K14491]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23H00151]
  • MEXT ∣ Japan Society for the Promotion of Science [JP19K21884]
  • MEXT ∣ Japan Society for the Promotion of Science [JP20H01947]
  • MEXT ∣ Japan Society for the Promotion of Science [JP20KK0071]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23K20239]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24K00672]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24K17104]
  • MEXT ∣ Japan Society for the Promotion of Science [JP24K17093]
  • MEXT ∣ Japan Society for the Promotion of Science [JP20K04009]
  • MEXT ∣ Japan Society for the Promotion of Science [JP21H04493]
  • MEXT ∣ Japan Society for the Promotion of Science [JP20H01946]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23K13154]
  • MEXT ∣ Japan Society for the Promotion of Science [JP19K14762]
  • MEXT ∣ Japan Society for the Promotion of Science [JP20H05857]
  • MEXT ∣ Japan Society for the Promotion of Science [JP25K23398]
  • MEXT ∣ Japan Society for the Promotion of Science [JP23K03459]
  • UKRI ∣ Science and Technology Facilities Council [ST/T000244/1]
  • Canadian Space Agency [18XARMSTMA]
  • National Science Foundation - Collaborative Research: Dust Echo Tomography: New Diagnostics for Galactic Dust and Magnetic Fields [2205918]
Citation (ISO format)
XRISM Collaboration. A XRISM/Resolve View of the Dynamics in the Hot Gaseous Atmosphere of M87. In: The Astrophysical journal, 2026, vol. 998, n° 2, p. 210. doi: 10.3847/1538-4357/ae2c5c
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Article (Published version)
Identifiers
Journal ISSN0004-637X
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