Performance of LAPEX and its spectroscopic capabilities in the 20-300 keV energy band to observe SN1987a

Computer Science – Performance

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X- And Gamma-Ray Telescopes And Instrumentation, X-Ray, Supernovae

Scientific paper

Recent observations of SN1987a both in the 1-10 keV and in the 10-350 keV energy range detected X-ray emission from the source with a very hard spectrum, a power law with α~1.4, and a flux of ~10 mCrab at 30 keV. We describe the performances of the LAPEX experiment for observation of SN1987a. In the 20-300 keV operative energy band of LAPEX, the following goals can be achieved: detection of emission lines due to Co57 (122 keV) and Ti44 (67.9 and 78.4 keV), elements that could be produced in the supernova explosion; measurement of the comptonized spectrum from the expanding ejecta; investigation on possible coherent pulsations due to a newly born pulsar down to timescales of ~0.1 ms. In the following, a thorough description of the payload and of its performances will be given.

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