Timing Results from the 16 ms Pulsar, J0537-6910 in N157B

Details Timing Results from the 16 ms Pulsar, J0537-6910 in N157B Timing Results from the 16 ms Pulsar, J0537-6910 in N157B

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.1209m&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #12.09; Bulletin of the American Astronomical Society, Vol. 33, p.1174

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Scientific paper

We present a status report on our on-going intensive RXTE monitoring campaign of PSR J0537-6910 begun in Jan 1999. PSR J0537-6910 is the 16 ms Crab-like X-ray pulsar in the LMC remnant N157B discovered in 1998 with the Rossi X-ray Timing Explorer (RXTE). This timing campaign reveals 5 large ``glitches'' in the pulsar's spindown which occurred at approximately 160-day intervals, resulting in relative increases of ~0.16-0.64 x 10-6 of the pulse frequency. PSR J0537-6910 is the most rapidly rotating Crab like pulsar, and although it is the oldest such pulsar, its rate of glitching is the highest of all known Crab-like systems and is additionally unique among all pulsars because of two other characteristics. First, a timing ``disturbance'' which is sufficiently large to defeat attempts to maintain count cycle over intervals of >= 1 week precedes the much larger gain in frequency from its glitches by ~ 1 week. Second, the pulsar can go for years, or even decades, without increasing its timing age measure, i.e., ěrt f/fdot ěrt actually decreases rather than increases. Thus the pulsar appears to grow younger with time, and has grown younger by 9 months over a two-year span in this campaign. The long term spindown of the pulsar continues to average -1.9743 x 10-10 Hz/s, i.e., the same value previously reported from the discovery observations. Continued monitoring will reveal exactly how the pulsar manages to produce its ``pre-glitch'' timing behavior, and perhaps how it finally increases its age.

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