The effect of convection on the propagation of relativistic galactic electrons

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Diffusion, Galactic Radiation, Milky Way Galaxy, Relativistic Particles, Transport Properties, Boundary Value Problems, Cosmic Rays, Diffusion Coefficient, Electronic Spectra, Green'S Functions, Radiant Flux Density, Radio Sources (Astronomy), Steady State, Synchrotron Radiation, Wave Propagation

Scientific paper

The paper presents exact analytical solutions which describe steady-state transport of relativistic electrons subject to diffusion, convection, and radiation losses. The diffusion coefficient is spatially and energy dependent; the bulk convection velocity is considered to be constant and directed outward from the galactic plane. The electron spectral behavior with respect to galactic height and energy indicates that convection provides a 'break' in the steady-state energy spectrum without recourse to distribution of sources. Radio observations of NGC 891 and NGC 4631 galaxies can be used to estimate their diffusion coefficient and its energy dependence. Application of analytical solutions to our Galaxy indicates that the diffusion coefficient and outflow velocity deduced from relativistic electron measurements and radio observations of their synchrotron radiation agree with values based on the transport of the cosmic ray nucleonic component.

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