The spectral index distribution of M51

Details The spectral index distribution of M51 The spectral index distribution of M51

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61...59s&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 1, Oct. 1977, p. 59-67. Research supported by the Nederlandse Organisatie voor Zuiver-

Astronomy and Astrophysics

Astrophysics

11

Astronomical Models, Electron Diffusion, Galactic Radio Waves, High Energy Electrons, Radio Spectra, Diffusion Coefficient, Indexes (Ratios), Interstellar Magnetic Fields, Nonthermal Radiation, Relativistic Particles, Thermal Emission

Scientific paper

The radial variation in M51 of the spectral index of the nonthermal radio spectrum between wavelengths of 21 and 49 cm is discussed. It is shown that the spectral-index variation is unlikely to be caused by variation of the thermal emission component with galactocentric distance. A diffusion model for the relativistic-electron motion in the galactic magnetic field is developed to provide a general fit to the observations. The following parameters are derived: a diffusion coefficient of the order of 10 to the 29th power sq cm/sec, a leakage time of about 30 million years for the relativistic electrons, and an energy-injection spectral index of approximately 2.2.

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