✦ LIBER ✦

Thermal and non-thermal soft X-ray bursts

✍ Scribed by M. Landini; B. C. Monsignori Fossi; R. Pallavicini

Publisher: Springer
Year: 1972
Tongue: English
Weight: 421 KB
Volume: 27
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00151780

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✦ Synopsis

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 • l0 s and 30 • 10~K and emission measures, SNe2 dV, between 1047 and 1048 cm -8.

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-v 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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