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XMM-Newton observation of the highly magnetized accreting pulsar Swift J045106.8−694803: evidence of a hot thermal excess

Several persistent, low-luminosity (LX ∼ 10 34 erg s −1 ), long-spin-period (P > 100 s) highmass X-ray binaries have been reported with blackbody components with temperatures > 1k eV. These hot thermal excesses have correspondingly small emitting regions ( 2 keV) and soft (< 2k eV) light curves is anticorrelated with the pulse profile. Simulations of the spectrum suggest that this is caused by the pulsations of the blackbody being ∼ π out of phase with those of the power-law component. Using a simple model for emission from hot spots on the neutron star surface, we fit the pulse profile of the blackbody component to obtain an indication of the geometry of the system.