ar X iv : a st ro - p h / 97 10 11 4 v 1 1 0 O ct 1 99 7 The X – ray Spectrum of the Plerionic System PSR B 1509 −
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چکیده
We present the results of observations of the PSR B1509−58/MSH 15−52 system in X–rays (2 − 250 keV) by the Rossi X–ray Timing Explorer. The spectra of the peak of the pulsed component (radio phase 0.17 − 0.53) is fit by a power law of photon index 1.36 ± 0.01, with no evidence of a high energy spectral break seen up to ∼ 200 keV. For the off-pulse spectral component, the spectrum from 2 − 250 keV is fit by a power law of photon index 2.215 ± 0.005. An iron emission line at 6.7 keV with an equivalent width of 129 eV improves the fit, but only at a marginal significance. Thermal bremsstrahlung and Raymond-Smith models produce much worse fits to the unpulsed data. The lack of a high energy spectral break in the pulsed emission implies an efficiency of ≥ 3% in the conversion of pulsar spindown energy to pulsed X–rays in the system.
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