Swift J045106.8-694803; a highly magnetised neutron star in the Large
  Magellanic Cloud
  We report the analysis of a highly magnetised neutron star in the Large
Magellanic Cloud (LMC). The high mass X-ray binary pulsar Swift
J045106.8-694803 has been observed with Swift X-ray telescope (XRT) in 2008,
the Rossi X-ray Timing Explorer (RXTE) in 2011 and the X-ray Multi-Mirror
Mission - Newton (XMM-Newton) in 2012. The change in spin period over these
four years indicates a spin-up rate of -5.01+/-0.06 s/yr, amongst the highest
observed for an accreting pulsar. This spin-up rate can be accounted for using
Ghosh and Lamb's (1979) accretion theory assuming it has a magnetic field of
(1.2 +0.2 -0.7)x10^14 Gauss. This is over the quantum critical field value.
There are very few accreting pulsars with such high surface magnetic fields and
this is the first of which to be discovered in the LMC. The large spin-up rate
is consistent with Swift Burst Alert Telescope (BAT) observations which show
that Swift J045106.8-694803 has had a consistently high X-ray luminosity for at
least five years. Optical spectra have been used to classify the optical
counterpart of Swift J045106.8-694803 as a B0-1 III-V star and a possible
orbital period of 21.631+/-0.005 days has been found from MACHO optical
photometry.
