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We present a deep Chandra X-ray Observatory study of the peculiar binaryradio millisecond pulsar PSR J1740--5340 and candidate millisecond pulsars(MSPs) in the globular cluster NGC 6397. The X-rays from PSR J1740--5340 appearto be non-thermal and exhibit variability at the binary period. Theseproperties suggest the presence of a relativistic intrabinary shock formed dueto interaction of a relativistic rotation-powered pulsar wind and outflow fromthe unusual "red-straggler/sub-subgiant" companion. We find the X-ray sourceU18 to show similar X-ray and optical properties to those of PSR J1740--5340,making it a strong MSP candidate. It exhibits variability on timescales fromhours to years, also consistent with an intrabinary shock origin of its X-rayemission. The unprecedented depth of the X-ray data allows us to conduct acomplete census of MSPs in NGC 6397. Based on the properties of the presentsample of X-ray--detected MSPs in the Galaxy we find that NGC 6397 probablyhosts no more than 6 MSPs.

A Chandra X-ray Observatory Study of PSR J1740--5340 and Candidate Millisecond Pulsars in the Globular Cluster NGC 6397