We report the discovery of two young isolated radio pulsars with very high inferred magnetic fields. PSR J1119−6127 has period P = 0.407 s, and the largest period derivative known among radio pulsars,Ṗ = 4.0×10 −12 . Under standard assumptions these parameters imply a characteristic spin-down age of only τ c = 1.6 kyr and a surface dipole magnetic field strength of B = 4.1 × 10 13 G. We have measured a stationary period-secondderivative for this pulsar, resulting in a braking index of n = 2.91 ± 0.05. We have also observed a glitch in the rotation of the pulsar, with fractional period change ∆P/P = −4.4 × 10 −9 . Archival radio imaging data suggest the presence of a previously uncataloged supernova remnant centered on the pulsar. The second pulsar, PSR J1814−1744, has P = 3.975 s andṖ = 7.4 × 10 −13 . These parameters imply τ c = 85 kyr, and B = 5.5 × 10 13 G, the largest of any known radio pulsar.Both PSR J1119−6127 and PSR J1814−1744 show apparently normal radio emission in a regime of magnetic field strength where some models predict that no emission should occur. Also, PSR J1814−1744 has spin parameters similar to the anomalous X-ray pulsar (AXP) 1E 2259+586, but shows no discernible X-ray emission. If AXPs are isolated, high magnetic field neutron stars ("magnetars"), these results suggest that their unusual attributes are unlikely to be merely a consequence of their very high inferred magnetic fields.
The Parkes multi-beam pulsar survey is a sensitive survey of a strip along the Galactic plane with \b\ < 5<degrees> and l = 260 degrees to l = 50 degrees. It uses a 13-beam receiver on the 64-m Parkes radio telescope. receiving two polarizations per beam over a 288-MHz bandwidth centred on 1374 MHz. The receiver and data acquisition systems are described in some detail. For pulsar periods in the range 0.1-2 s and dispersion measures of less than 300 cm(-3) pc, the nominal limiting flux density of the survey is about 0.2 mJy. At shorter or longer periods or higher dispersions, the sensitivity is reduced. Timing observations are carried out for pulsars discovered in the survey for 12-18 months after confirmation to obtain accurate positions, spin parameters, dispersion measures, pulse shapes and mean flux densities. The survey is proving to be extremely successful, with more than 600 pulsars discovered so far. We expect that, when complete, this one survey will come close to finding as many pulsars as all previous pulsar surveys put together. The newly discovered pulsars tend to be young, distant and of high radio luminosity. They will form a valuable sample for studies of pulsar emission properties, the Galactic distribution and evolution of pulsars, and as probes of interstellar medium properties. This paper reports the timing and pulse shape parameters for the first 100 pulsars timed at Parkes, including three pulsars with periods of less than 100 ms which are members of binary systems. These results are briefly compared with the parameters of the previously known population
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