The nature and energetics of AGN-driven perturbations in the hot gas in the Perseus Cluster
Abstract
In this paper, cores of relaxed galaxy clusters are often disturbed by AGN. Their Chandra observations revealed a wealth of structures induced by shocks, subsonic gas motions, bubbles of relativistic plasma, etc. In this paper, we determine the nature and energy content of gas fluctuations in the Perseus core by probing statistical properties of emissivity fluctuations imprinted in the soft- and hard-band X-ray images. About 80 per cent of the total variance of perturbations on ~8–70 kpc scales in the core have an isobaric nature, i.e. are consistent with subsonic displacements of the gas in pressure equilibrium with the ambient medium. The observed variance translates to the ratio of energy in perturbations to thermal energy of ~13 per cent. In the region dominated by weak ‘ripples’, about half of the total variance is associated with isobaric perturbations on scales of a few tens of kpc. If these isobaric perturbations are induced by buoyantly rising bubbles, then these results suggest that most of the AGN-injected energy should first go into bubbles rather than into shocks. Using simulations of a shock propagating through the Perseus atmosphere, we found that models reproducing the observed features of a central shock have more than 50more »
- Authors:
-
- Stanford Univ., Stanford, CA (United States)
- Max Planck Institute for Astrophysics, Garching (Germany); Space Research Institute (IKI), Moscow (Russia)
- Univ. de Valparaiso, Valparaiso (Chile)
- Univ. of Oxford, Oxford (United Kingdom)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Japan Aerospace Exploration Agency, Kanagawa (Japan)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1256639
- Report Number(s):
- SLAC-PUB-16551
Journal ID: ISSN 0035-8711; arXiv:1601.02615
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 458; Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; methods: observational-methods; statistical-techniques: image processing galaxies: clusters: intracluster medium-X-rays; galaxies: clusters
Citation Formats
Zhuravleva, I., Churazov, E., Arevalo, P., Schekochihin, A. A., Forman, W. R., Allen, S. W., Simionescu, A., Sunyaev, R., Vikhlinin, A., and Werner, N. The nature and energetics of AGN-driven perturbations in the hot gas in the Perseus Cluster. United States: N. p., 2016.
Web. doi:10.1093/mnras/stw520.
Zhuravleva, I., Churazov, E., Arevalo, P., Schekochihin, A. A., Forman, W. R., Allen, S. W., Simionescu, A., Sunyaev, R., Vikhlinin, A., & Werner, N. The nature and energetics of AGN-driven perturbations in the hot gas in the Perseus Cluster. United States. https://doi.org/10.1093/mnras/stw520
Zhuravleva, I., Churazov, E., Arevalo, P., Schekochihin, A. A., Forman, W. R., Allen, S. W., Simionescu, A., Sunyaev, R., Vikhlinin, A., and Werner, N. Mon .
"The nature and energetics of AGN-driven perturbations in the hot gas in the Perseus Cluster". United States. https://doi.org/10.1093/mnras/stw520. https://www.osti.gov/servlets/purl/1256639.
@article{osti_1256639,
title = {The nature and energetics of AGN-driven perturbations in the hot gas in the Perseus Cluster},
author = {Zhuravleva, I. and Churazov, E. and Arevalo, P. and Schekochihin, A. A. and Forman, W. R. and Allen, S. W. and Simionescu, A. and Sunyaev, R. and Vikhlinin, A. and Werner, N.},
abstractNote = {In this paper, cores of relaxed galaxy clusters are often disturbed by AGN. Their Chandra observations revealed a wealth of structures induced by shocks, subsonic gas motions, bubbles of relativistic plasma, etc. In this paper, we determine the nature and energy content of gas fluctuations in the Perseus core by probing statistical properties of emissivity fluctuations imprinted in the soft- and hard-band X-ray images. About 80 per cent of the total variance of perturbations on ~8–70 kpc scales in the core have an isobaric nature, i.e. are consistent with subsonic displacements of the gas in pressure equilibrium with the ambient medium. The observed variance translates to the ratio of energy in perturbations to thermal energy of ~13 per cent. In the region dominated by weak ‘ripples’, about half of the total variance is associated with isobaric perturbations on scales of a few tens of kpc. If these isobaric perturbations are induced by buoyantly rising bubbles, then these results suggest that most of the AGN-injected energy should first go into bubbles rather than into shocks. Using simulations of a shock propagating through the Perseus atmosphere, we found that models reproducing the observed features of a central shock have more than 50 per cent of the AGN-injected energy associated with the bubble enthalpy and only about 20 per cent is carried away with the shock. Such energy partition is consistent with the AGN-feedback model, mediated by bubbles of relativistic plasma, and supports the importance of turbulence in the cooling–heating balance.},
doi = {10.1093/mnras/stw520},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 458,
place = {United States},
year = {Mon Mar 07 00:00:00 EST 2016},
month = {Mon Mar 07 00:00:00 EST 2016}
}
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