Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..881l&link_type=abstract
Astrophysical Journal, Part 1, vol. 216, Sept. 15, 1977, p. 881, 882.
Astronomy and Astrophysics
Astrophysics
11
Astrophysics, Field Strength, Pair Production, Stellar Magnetic Fields, Black Body Radiation, Black Holes (Astronomy), Bremsstrahlung, Neutron Stars, Photons
Scientific paper
Zaumen (1976) found that spontaneous pair production in a uniform magnetic field should be a feasible process for field strengths at least of the order of 10 to the 20th power gauss. This note points out that a magnetic field of this order of magnitude is most unlikely to occur in realistic astrophysical situations because of the large dynamical and quantum-mechanical effects such a field would produce. It is suggested that Zaumen's calculation would probably have little bearing on the suspected evolution of astrophysical systems since other processes (either dynamical or quantum-mechanical) apparently limit the field strength before such high magnetic fields would be reached. An upper limit of about 10 to the 16th power gauss is obtained by considering the isotropy of the 3-K blackbody radiation, the formation of collapsed objects in very high magnetic fields, and magnetic bremsstrahlung processes in quantum electrodynamics.
Lerche Ian
Schramm David N.
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