A Phase-connected Braking Index Measurement for the Large Magellanic Cloud Pulsar PSR B0540-69

Details A Phase-connected Braking Index Measurement for the Large Magellanic Cloud Pulsar PSR B0540-69 A Phase-connected Braking Index Measurement for the Large Magellanic Cloud Pulsar PSR B0540-69

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...554l.177z&link_type=abstract

The Astrophysical Journal, Volume 554, Issue 2, pp. L177-L180.

Astronomy and Astrophysics

Astronomy

29

Stars: Pulsars: Individual: Alphanumeric: Psr B0540-69, Stars: Neutron, X-Rays: Stars

Scientific paper

We report the results of an extensive monitoring campaign of PSR B0540-69, the 50 ms pulsar in the Large Magellanic Cloud, using data acquired with the Rossi X-Ray Timing Explorer. A set of 45 pointed X-ray observations spanning 1.2 yr reveals a steady spin-down interrupted by a single glitch event, the first recorded for this young, rotation-powered pulsar. The quality of the data allowed us to perform a pulse-timing analysis that successfully maintains cycle count between observations, after allowing for the observed glitch. The glitch event occurred on MJD 51,325+/-45 (90% CL error) and is characterized by a change in frequency of Δν/ν=(1.90+/-0.04)×10-9 and in frequency derivative of Δν/ν=(8.5+/-0.5)×10-5. By phase-linking the data set we provide a definitive measurement of the spin frequency of the pulsar and its first and second derivatives. These translate into a braking index of n=1.81+/-0.07, significantly lower than reported previously for this source using measurements that could not be phase-linked unambiguously.

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