Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7365
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dc.contributor.authorSur, Sharanya-
dc.date.accessioned2020-11-26T15:06:12Z-
dc.date.available2020-11-26T15:06:12Z-
dc.date.issued2019-12-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 488, No. 3, 3439en_US
dc.identifier.issn1365-2966-
dc.identifier.urihttp://prints.iiap.res.in/handle/2248/7365-
dc.descriptionRestricted Access © Royal Astronomical Society https://academic.oup.com/mnras/article/488/3/3439/5531336en_US
dc.description.abstractWe explore the decay of turbulence and magnetic fields generated by fluctuation dynamo action in the context of galaxy clusters where such a decaying phase can occur in the aftermath of a major merger event. Using idealized numerical simulations that start from a kinetically dominated regime we focus on the decay of the steady state rms velocity and the magnetic field for a wide range of conditions that include varying the compressibility of the flow, the forcing wavenumber, and the magnetic Prandtl number. Irrespective of the compressibility of the flow, both the rms velocity and the rms magnetic field decay as a power law in time. In the subsonic case we find that the exponent of the power law is consistent with the − 3/5 scaling reported in previous studies. However, in the transonic regime both the rms velocity and the magnetic field initially undergo rapid decay with an ≈ t − 1.1 scaling with time. This is followed by a phase of slow decay where the decay of the rms velocity exhibits an ≈− 3/5 scaling in time, while the rms magnetic field scales as ≈− 5/7. Furthermore, analysis of the Faraday rotation measure (RM) reveals that the Faraday RM also decays as a power law in time ≈ t − 5/7 ; steeper than the ∼ t − 2/5 scaling obtained in previous simulations of magnetic field decay in subsonic turbulence. Apart from galaxy clusters, our work can have potential implications in the study of magnetic fields in elliptical galaxies.en_US
dc.language.isoenen_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.subjectdynamoen_US
dc.subjectMHDen_US
dc.subjectturbulenceen_US
dc.subjectgalaxies: clusters: generalen_US
dc.subjectgalaxies: magnetic fields.en_US
dc.titleDecaying turbulence and magnetic fields in galaxy clustersen_US
dc.typeArticleen_US
Appears in Collections:IIAP Publications

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