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Date and Time of the Query: 2019-04-24 T17:08:21 PDT
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For refcode 2016MNRAS.455L..41B:
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Copyright by Royal Astronomical Society. 2016MNRAS.455L..41B Do radio mini-halos and gas heating in cool-core clusters have a common origin? Bravi, L.; Gitti, M.; Brunetti, G. Abstract. In this Letter, we present a study of the central regions of cool-core clusters hosting radio mini-halos, which are diffuse synchrotron sources extended on cluster-scales surrounding the radio-loud brightest cluster galaxy. We aim to investigate the interplay between the thermal and non-thermal components in the intracluster medium in order to get more insights into these radio sources, whose nature is still unclear. It has recently been proposed that turbulence plays a role for heating the gas in cool cores. By assuming that mini-halos are powered by the same turbulence, we expect that the integrated radio luminosity of mini-halos, nuP_nu_, depends on the cooling flow power, P_CF_, which in turn constrains the energy available for the non-thermal components and emission in the cool-core region. We carried out a homogeneous re-analysis of X-ray Chandra data of the largest sample of cool-core clusters hosting radio mini-halos currently available (~20 objects), finding a quasi-linear correlation, nu P_{nu}_ is proportional to P_CF^{0.8}. We show that the scenario of a common origin of radio mini-halos and gas heating in cool-core clusters is energetically viable, provided that mini-halos trace regions where the magnetic field strength is B >> 0.5 muG. Key words: radiation mechanisms: non-thermal, methods: data analysis, galaxies: clusters: general, galaxies: clusters: intracluster medium, galaxies: magnetic fields, radio continuum: general
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