Theories of radio halo formation - Application to the Coma cluster

Details Theories of radio halo formation - Application to the Coma cluster Theories of radio halo formation - Application to the Coma cluster

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..141v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 141-147.

Astronomy and Astrophysics

Astronomy

18

Galactic Clusters, Halos, Radio Sources (Astronomy), Electron Diffusion, Magnetic Fields, Mass Distribution, Proton Scattering, Radiation Distribution

Scientific paper

The origin of Coma-type radio halos is considered. The expected intensity distribution of diffuse radiation is calculated using different models for the radio halo formation, and compared with observations. In all models, rapid diffusion with super-Alfvénic bulk velocities is required to explain the extent of the halo; the most likely origin for the electrons is leakage out of the cluster radio sources. The radio halo is probably an old, stationary feature. The rarity of Coma-type halos may result from the lack of extended magnetic fields in all but the most evolved clusters. The diffuse X-ray and radio emissions reflect the gas distribution in the cluster, and have similar morphologies, even if there is no direct link between them.

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