Speaker
Dr
Vojtech Simon
(Astronomical Institute AS CR)
Description
We review the processes and conditions that lead to the production of non-thermal radiation in cataclysmic variables (CVs). We focus on the cases when such emission was really observed in various spectral bands, from gamma rays including TeV emission to radio. Detection of this radiation suggests the presence of highly energetic particles in these CV systems. Synchrotron and cyclotron emissions also suggest the presence of strong magnetic fields in CV. The propeller effect in the case of the rapidly rotating magnetized white dwarf (WD) or a shock in the case of a strongly magnetized WD can lead to the strong acceleration of the particles; even Cherenkov radiation is possible in the extreme cases. In some CVs, e.g. during some dwarf nova outbursts, the magnetic field generated in the accretion disk leads to the synchrotron jets. Even gamma-ray production via $\pi^{\rm o}$ decay was observed in the ejecta of an explosion of a symbiotic classical nova (CN). Nuclear reactions during thermonuclear runaway in the outer layer of the WD undergoing CN explosion lead to the production of radioactive isotopes; they are the sources of gamma-ray emission.
Primary author
Dr
Vojtech Simon
(Astronomical Institute AS CR)
