dc.contributor.author Fabian, Andrew en dc.contributor.author Walker, Stephen en dc.contributor.author Russell, Helen en dc.contributor.author Pinto, Ciro en dc.contributor.author Sanders, JS en dc.contributor.author Reynolds, Christopher en dc.date.accessioned 2017-01-16T13:16:05Z dc.date.available 2017-01-16T13:16:05Z dc.date.issued 2017-01-01 en dc.identifier.issn 0035-8711 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/261878 dc.description.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. dc.description.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. dc.language.iso en en dc.publisher Oxford University Press dc.subject galaxies: clusters: intracluster medium en dc.subject X-rays: galaxies en dc.title Do sound waves transport the AGN energy in the Perseus cluster? en dc.type Article prism.endingPage L5 prism.issueIdentifier 1 en prism.publicationDate 2017 en prism.publicationName Monthly Notices of the Royal Astronomical Society: Letters en prism.startingPage L1 prism.volume 464 en dc.identifier.doi 10.17863/CAM.7109 dcterms.dateAccepted 2016-08-24 en rioxxterms.versionofrecord 10.1093/mnrasl/slw170 en rioxxterms.version VoR en rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved en rioxxterms.licenseref.startdate 2017-01-01 en dc.contributor.orcid Fabian, Andrew [0000-0002-9378-4072] dc.contributor.orcid Pinto, Ciro [0000-0003-2532-7379] dc.contributor.orcid Reynolds, Christopher [0000-0002-1510-4860] dc.identifier.eissn 1365-2966 rioxxterms.type Journal Article/Review en pubs.funder-project-id European Research Council (340442) pubs.funder-project-id SCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000927/1) cam.issuedOnline 2016-08-30 en cam.orpheus.success Thu Jan 30 12:56:48 GMT 2020 - The item has an open VoR version. * rioxxterms.freetoread.startdate 2100-01-01
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