Thermal and non-thermal soft X-ray bursts |
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| Authors: | M Landini B C Monsignori Fossi R Pallavicini |
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| Institution: | (1) Osservatorio Astrofisico di Arcetri, Firenze, Italy |
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| Abstract: | X-ray bursts observed for energies lower than 25 keV are usually interpreted as being produced by a thermal plasma with several million degrees of temperature.A small number of events recorded at Arcetri by real time telemetry of SOLRAD 9 satellite agrees with a thermal interpretation and gives temperatures ranging between 10 × 106 and 30 × 106K and emission measures,  N
e
2
dV, between 1047 and 1048 cm–3.An impulsive event recorded on January 7, 1969 shows an anomalous behaviour. In this case the emission has been attributed to bremsstrahlung radiation from electrons with a power law energy distribution dN = KE
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dE. The values of the spectral index and of the emission measure are given.A tentative interpretation of the event is suggested and the way to produce non-relativistic electrons with a power law energy distribution is investigated. |
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