Abstract
We observed 8 pulsars with high spin down flux and searched for pulsation in the X-ray band (0.6–10 keV) with ASCA. We detected X-ray emission from all pulsars, including new detection in the 2–10 keV band for 3 pulsars. We also found pulsed emission from 3 pulsars including the first detection of millisecond pulsar PSR B1821−24 [1]. The pulse of PSR B1821−24 has sharp double peaks similar to that of the Crab pulsar and power-law spectrum which strongly suggest the magnetospheric origin. We found an empirical relation between the pulsed luminosity LX(pulse) and the rotation energy loss Ėrot in the X-ray band among all X-ray pulsars observed with ASCA. The pulsed luminosity is consistent with the relation LX(pulse)∝Ėrot3/2, while those for the pulsed emission in γ-ray band Lγ(pulse) is Lγ(pulse)∝Ėrot1/2. It should be noted that the empirical relation in the X-ray band holds also for the millisecond pulsar PSR B1821−24, which suggests same pulse emission mechanism works for millisecond pulsars.
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