Do sound waves transport the AGN energy in the Perseus cluster?
Publication Date
2017-01-01Journal Title
Monthly Notices of the Royal Astronomical Society: Letters
ISSN
0035-8711
Publisher
Oxford University Press
Volume
464
Issue
1
Pages
L1-L5
Language
English
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Fabian, A., Walker, S., Russell, H., Pinto, C., Sanders, J., & Reynolds, C. (2017). Do sound waves transport the AGN energy in the Perseus cluster?. Monthly Notices of the Royal Astronomical Society: Letters, 464 (1), L1-L5. https://doi.org/10.1093/mnrasl/slw170
Abstract
The level of random motions in the intracluster gas lying between 20 and 60 kpc radius in the core of the Perseus cluster has been measured by the Hitomi Soft X-ray Spectrometer (SXS) at 164 ± 10 km s$^{−1}$ . The maximum energy density in turbulent motions on that scale is therefore low. If dissipated as heat, the turbulent energy will be radiated away in less than 80 Myr and cannot spread across the core. A higher velocity is needed to prevent a cooling collapse. Gravity waves are shown to travel too slowly in a radial direction. Here we investigate propagation of energy by sound waves. The energy travels at ~1000 km s$^{−1}$ and can cross the core in a cooling time. We show that the displacement velocity amplitude of the gas required to carry the power is consistent with the Hitomi result and that the inferred density and temperature variations are consistent with $\textit{Chandra}$ observations.
Keywords
galaxies: clusters: intracluster medium, X-rays: galaxies
Sponsorship
ACF, CP, CSR and HRR thank the Hitomi collaboration for the opportunity to participate in the analysis of the SXS data. ACF, CP, HRR and SAW acknowledge support from ERC Advanced Grant FEEDBACK, 340442.
Funder references
European Research Council (340442)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000927/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1093/mnrasl/slw170
This record's URL: https://www.repository.cam.ac.uk/handle/1810/261878
Rights
Licence:
http://www.rioxx.net/licenses/all-rights-reserved