A lower limit to the magnetic field in Cassiopeia-A

Details A lower limit to the magnetic field in Cassiopeia-A A lower limit to the magnetic field in Cassiopeia-A

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.191..855c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 191, June 1980, p. 855-861.

Astronomy and Astrophysics

Astronomy

29

Gamma Ray Astronomy, Magnetic Flux, Radio Emission, Supernova Remnants, Bremsstrahlung, Compton Effect, Magnetohydrodynamic Stability, Relativistic Particles

Scientific paper

The magnetic field strength in the radio emitting shell of the supernova remnant Cassiopeia A is discussed with regard to recent observations of gamma-ray emissivity. It is found that the nebular field must be larger than 8 x 10 to the -5th G, so that the expected bremsstrahlung gamma-ray flux does not exceed the observational upper limit of 10 to the -6th power per sq cm sec at 100 MeV. In addition, it is shown that this field strength must arise from magnetohydrodynamic instabiliies in the expanding shell.

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