On the Significance of Coherent Plasma Radio-Wave Emission for Quasi-Stellar Radio Objects and Supernovae Remnants

The possibility of interpreting the radio waves from the "compact" long-wave radio source in the Crab Nebula and part of the radiation from quasi-stellar objects on the basis of the coherent plasma mechanism is discussed. This seems to be quite feasible for the "compact" source in the Crab, even when the effect of the magnetic field is not taken into account. The variable centimeter and decimeter waves from quasi-stellar objects may also be of a coherent plasma nature but apparently only if the effect of the magnetic field is taken into account The problem of reabsorption of non-coherent magnetobremsstrahlung radiation in radio sources with a homogeneous or inhomogeneous field is analyzed in the Appendix.