Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..697b&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 697-700
Astronomy and Astrophysics
Astrophysics
1
Microwaves, Particle Acceleration, Radio Bursts, X Rays, Electron Distribution, Frequency Distribution, Magnetic Effects, Shock Wave Propagation, Thermal Conductivity
Scientific paper
In a sample of impulsive bursts with rise times less than 30 s, a correlation between burst rise times and the frequency of maximum microwave emission has been found. The implications for source structure and dynamics are discussed. Previously evidence was found that such bursts are caused by some propagating disturbance such as a shock wave or thermal conduction front. Combining that evidence with the microwave and hard X-ray spectral information suggests that the most rapid bursts are emitted from the most compact and intensely magnetized sources. The most rapid bursts also exhibited the hardest X-ray spectra, as published previously. These facts are important clues to understanding the physical process responsible for impulsive bursts. A model for the bursts is suggested, based on the observations and inferences described.
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