Line feature around 73 keV from the Crab Nebula

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Balloon-Borne Instruments, Crab Nebula, Cyclotron Radiation, Gamma Ray Astronomy, X Ray Sources, Data Reduction, Line Spectra, Proportional Counters, Pulsars, Spectrum Analysis, X Ray Spectra

Scientific paper

Observational data for the Crab Nebula obtained with a balloon-borne, multiwire high-pressure xenon proportional counter indicate an X-ray spectrum line feature at approximately 73 keV. Source continuous emission fits a power law of 16.5E to the -2.3, and a line intensity of 0.005 + or - 0.0015 photons/sq cm per sec is arrived at, for an equivalent width of 3 keV. These results are discussed in light of the possibility of a cyclotron emission process serving as the mechanism for the observed line.

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