XRISM Constrains Atmospheric Motion and Turbulent Dissipation in the Archetypal Radio-mode Feedback System Hydra-A

Abstract We present XRISM Resolve observations centered on Hydra-A, a redshift z = 0.054 brightest cluster galaxy, which hosts one of the largest and most powerful FR-I radio sources in the nearby Universe. We examine the effects of its high jet power on the velocity structure of the cluster’s hot atmosphere. Hydra-A’s central radio jets have inflated X-ray cavities with energies upward of 10 61 erg. They reach altitudes of 225 kpc from the cluster center, well beyond the atmosphere’s central cooling region. Resolve’s 3′× 3′ field of view covers 190 × 190 kpc, which encompasses most of the cooling volume. We find a one-dimensional atmospheric velocity dispersion across the volume of 164 ± 10 km s −1 . The fraction in isotropic turbulence or unresolved bulk velocity is unknown. Assuming pure isotropic turbulence, the turbulent kinetic energy is 2.5% of the thermal energy radiated away over the cooling timescale, implying that kinetic energy must be supplied continually to offset cooling. While Hydra-A’s radio jets are powerful enough to supply kinetic energy to the atmosphere at the observed level, turbulent dissipation alone would struggle to offset cooling throughout the cooling volume. The central galaxy’s radial velocity is similar to the atmospheric velocity, with an offset of −37 ± 23 km s −1 .

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Publication Details

Journal
The Astrophysical Journal
Published
2025-08-25
DOI
https://doi.org/10.3847/1538-4357/adf32d
Citations
3
Primary Topic
Astrophysics and Cosmic Phenomena
Type
article
Field-Weighted Citation Impact
5.61

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article

XRISM Constrains Atmospheric Motion and Turbulent Dissipation in the Archetypal Radio-mode Feedback System Hydra-A

Jean‐Luc Meunier, F. Paerels, Eric D. Miller, P. E. J. Nulsen et al.
3 citations
The Astrophysical Journal
Astrophysics and Cosmic Phenomena
5.61
article

XRISM Constrains Atmospheric Motion and Turbulent Dissipation in the Archetypal Radio-mode Feedback System Hydra-A

Jean‐Luc Meunier, F. Paerels, Eric D. Miller, P. E. J. Nulsen, A. C. Fabian, A. Simionescu, Edmund Hodges‐Kluck, H. R. Russell, Alison L. Coil, Tom Rose, Maxim Markevitch, B. R. McNamara, Norbert Werner, M. W. Wise, M. McDonald, Timothy M. Heckman, Neo Dizdar
article en
3 citations

Abstract

Abstract We present XRISM Resolve observations centered on Hydra-A, a redshift z = 0.054 brightest cluster galaxy, which hosts one of the largest and most powerful FR-I radio sources in the nearby Universe. We examine the effects of its high jet power on the velocity structure of the cluster’s hot atmosphere. Hydra-A’s central radio jets have inflated X-ray cavities with energies upward of 10 61 erg. They reach altitudes of 225 kpc from the cluster center, well beyond the atmosphere’s central cooling region. Resolve’s 3′× 3′ field of view covers 190 × 190 kpc, which encompasses most of the cooling volume. We find a one-dimensional atmospheric velocity dispersion across the volume of 164 ± 10 km s −1 . The fraction in isotropic turbulence or unresolved bulk velocity is unknown. Assuming pure isotropic turbulence, the turbulent kinetic energy is 2.5% of the thermal energy radiated away over the cooling timescale, implying that kinetic energy must be supplied continually to offset cooling. While Hydra-A’s radio jets are powerful enough to supply kinetic energy to the atmosphere at the observed level, turbulent dissipation alone would struggle to offset cooling throughout the cooling volume. The central galaxy’s radial velocity is similar to the atmospheric velocity, with an offset of −37 ± 23 km s −1 .

The Astrophysical JournalVol. 990(1)
Goddard Space Flight Center (US), University of Nottingham (GB), Johns Hopkins University (US), University of Waterloo (CA), The University of Western Australia (AU), Masaryk University (CZ), University of Cambridge (GB), University of California San Diego (US), Kavli Institute for Particle Astrophysics and Cosmology (US), Center for Astrophysics Harvard & Smithsonian (US), International Centre for Radio Astronomy Research (AU), Space Research Organisation Netherlands (NL), Massachusetts Institute of Technology (US), Columbia University (US)
National Aeronautics and Space Administration, University of Nottingham, Grantová Agentura České Republiky, Nuclear Safety and Security Commission, Canadian Space Agency
Openalex Percentile: Top 5%
Astrophysics and Cosmic Phenomena
5.61
DOIOpen Access PDFOpenAlex
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