2005ApJ...619.1046L

We present an updated timing solution for the young, energetic pulsar PSR B1509-58 based on 21.3 yr of radio timing data and 7.6 yr of X-ray timing data. No glitches have occurred in this time span, in contrast to other well-studied young pulsars, which show frequent glitches. We report a measurement of the third frequency derivative of \lyr...nu=(-1.28±0.21)x10^–31s^–4. This value is 1.65 σ from (i.e., consistent with) that predicted by the simple constant magnetic dipole model of pulsar spin-down. We measured the braking index to be n=2.839±0.003 and show that it varies by 1.5% over 21.3 yr owing to contamination from timing noise.
Result. of a low-resolution power spectral analysis of the significant noise apparent in the data yield a spectral index of α=-4.6±1.0 for the red-noise component.