2016/03/01 by Luca Bravi, Bravi, Luca, Myriam Gitti +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Radio Astronomy Observations and Technology
paper · pdf · doi:10.48550/arxiv.1603.00368
openalex publication_date 2016/03/01 · openalex created_date 2022/08/09 · openalex updated_date 2026/07/28
In this work, we present a study of the central regions of cool-core clusters\nhosting radio mini-halos, which are di use synchrotron sources extended on\ncluster-scales surrounding the radio-loud brightest galaxy. We aim to\ninvestigate the interplay between the thermal and non-thermal components in the\nintracluster medium in order to get more insights into these radio sources,\nwhose nature is still unclear. It has recently been proposed that turbulence\nplays a role for heating the gas in cool cores. A correlation between the radio\nluminosity of mini-halos, \ν P\ν, and the cooling flow power, P rm\nCF, is expected in the case that this turbulence also plays a role for the\nacceleration of the relativistic particles. We carried out a homogeneous\nre-analysis of X-ray Chandra data of the largest sample of cool-core clusters\nhosting radio mini-halos currently available (\∼20 objects), finding a\nquasi-linear correlation, \ν P\ν \∝ P rm CF0.8. We show that\nthe scenario of a common origin of radio mini-halos and gas heating in\ncool-core clusters is energetically viable, provided that mini-halos trace\nregions where the magnetic field strength is B \≫ 0.5 \μ G.\n