Why are millisecond pulsar magnetic fields low and how do their X-rays arise

Binary millisecond pulsars (MSPs) found in the field are thought to be.recycled. from accreting pulsars. These MSPs have short periods, low spindownrates (Pdot) and consequently low surface magnetic fields (B_s) as B_s isproportional to sqrt(Pdot.P). It is unclear, however, how the MSP B_s can evolvefrom the high fields observed in pulsars to the low MSP values. Two models havebeen proposed to explain this evolution. Further, the origin of the high energyemission is unclear with too few MSP observations in the Xray domain todifferentiate between competing models. With these XMMNewton observations offour MSPs previously unobserved in Xrays, we will discriminate betweendiffering models describing the magnetic field evolution and the high energy emission origin. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]