Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...375..397c&link_type=abstract
Astronomy and Astrophysics, v.375, p.397-404 (2001)
Astronomy and Astrophysics
Astrophysics
20
Stars: Neutron, Pulsars: Individual: Psr B1509-58, X-Rays: Stars
Scientific paper
We report timing and spectral results for PSR B1509-58 observed by BeppoSAX in February 1998. We obtained pulse profiles with high statistical significance 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 separated ~ 0.13 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.
Cusumano Giancarlo
Hermsen Willem
Kuiper Lucien
Massaglia Silvano
Massaro Enrico
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