Ginga observations of isolated pulsars: PSR1509-58 and the Crab pulsar

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Abstract
The energy spectra and the pulse light curve of PSR1509–58 in the X‐ray range 2–60 keV are presented. The X‐ray pulse spectrum can be fitted by a power‐law model with a photon index of ∼1.3. The non‐pulse component is softer, and has a photon index of 2.2 if modeled by a power‐law. The Crab pulsar was observed by Ginga in March 1987 and September 1991. The variation of single pulse intensity was evaluated with a best statistics in the 2–11 keV X‐ray, but no significant deviation from the Poisson fluctuation was found. The long‐term variation of the relative intensity of the two peaks in the pulse profile was studied using the data taken 4.5 years apart. Unlike in the gamma‐ray range, no significant variation of the pulse peaks were found. In this respect the soft X‐ray pulse in the Crab pulsar shares more characteristics in common with the optical pulserather than the gamma‐ray.

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