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The low mass X-ray binary (LMXB) IGR J17480-2446 in the globular clusterTerzan 5 harbors an 11 Hz accreting pulsar. This is the first object discoveredin a globular cluster with a pulsar spinning at such low rate. The accretingpulsar is anomalous because its characteristics are very different from theother five known slow accreting pulsars in galactic LMXBs. Many features of the11 Hz pulsar are instead very similar to those of accreting millisecondpulsars, spinning at frequencies >100 Hz. Understanding this anomaly isvaluable because IGR J17480-2446 can be the only accreting pulsar discovered sofar which is in the process of becoming an accreting millisecond pulsar. Wefirst verify that the neutron star (NS) in IGR J17480-2446 is indeed spinningup by carefully analyzing X-ray data with coherent timing techniques thataccount for the presence of timing noise. We then study the present Roche lobeoverflow epoch and the two previous spin-down epochs dominated by magnetodipole radiation and stellar wind accretion. We find that IGR J17480-2446 isvery likely a mildly recycled pulsar and suggest that it has started a spin-upphase in an exceptionally recent time, that has lasted less than a few 10^7 yr.We also find that the total age of the binary is surprisingly low (<10^8 yr)when considering typical parameters for the newborn NS and propose differentscenarios to explain this anomaly.

The Peculiar Evolutionary History of IGR J17480-2446 in Terzan 5