Using observations made with the XMM-Newton Observatory, we report the probable X-ray detection of the high-magnetic-field radio pulsar PSR?J1734-3333. This pulsar has an inferred surface dipole magnetic field of B = 5.2 × 1013 G, just below that of one anomalous X-ray pulsar. We find that the pulsar has an absorbed 0.5-2.0?keV flux of (5-15) × 10–15 erg s-1 cm–2 and that its X-ray luminosity L X is well below its spin-down luminosity , with . No pulsations were detected in these data although our derived upper limit is unconstraining. Like most of the other high-B pulsars, PSR?J1734-3333 is X-ray faint with no sign of magnetar activity. We tabulate the properties of this and all other known high-B radio pulsars with measured thermal X-ray luminosities or luminosity upper limits, and speculate on a possible correlation between L X and B.
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