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- W2950844562 abstract "The Crab Nebula and the Pulsar have been pointed several times by the BeppoSAX satellite. We analysed all these observations, summed together, to study the main spectral properties with a good phase resolution. A new accurate estimate of the hydrogen column density in the Crab direction N_H=3.23 x 10^(21) cm^(-2) is given as derived from the analysis of the off-pulse emission at low energies. We studied the changes of the spectral index with the pulse phase and showed that in the interpeak region it is systematically harder than in the main peaks of about 0.4. We observed also a significant spectral steepening of the pulsed emission and showed that this distribution can be represented by a unique law with a linear variable log slope and apply it to the spectrum of the first peak. A two component model is proposed to explain the phase evolution of the spectrum. One component has the same profile observed in the optical while the other presents a maximum at the phase 0.4 with essentially the spectrum of the interpeak region. Two possible interpretations for the origin of the latter component are discussed." @default.
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- W2950844562 date "2000-06-05" @default.
- W2950844562 modified "2023-09-27" @default.
- W2950844562 title "Fine phase resolved spectroscopy of the X-ray emission of the Crab pulsar (PSR B0531+21) observed with BeppoSAX" @default.
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