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We report timing and spectral results for PSR B1509 58 observed by BeppoSAX in February 1998. We obtained pulse proles with high statistical signicance from 0.1 to 300 keV that exhibit the well-known broad asymmetric single pulse. The shape of this pulse does not change across this energy window and can be described as the sum of a narrow and a broader Gaussian component separated0:13 in phase. The spectral distribution can be accurately represented, over the entire BeppoSAX energy range, by a curved function rather than a simple power-law shape. The extrapolation of this model to higher energies is also consistent with the COMPTEL fluxes in the 0.75{30 MeV range, with the maximum luminosity for the broad pulse of PSR B1509 58 reached at 5:4 MeV. The comparison with the Crab pulsar spectrum suggests a possible origin of the X-ray emission in terms of synchrotron radiation from secondary pair particles near the neutron star.

The curved X-ray spectrum of PSR B1509-58 observed with BeppoSAX