Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.8303s&link_type=abstract
American Astronomical Society Meeting 205, #83.03; Bulletin of the American Astronomical Society, Vol. 36, p.1480
Astronomy and Astrophysics
Astronomy
Scientific paper
We have had a program of continuous observation of SAX J2103.5+4545 with the Rossi X-Ray Timing Explorer for more than two years. We have been able to unambiguously count the revolutions of the pulsar over this entire period. The period is characterized by weak spin-up of the pulsar which is dependent on the varying rate of accretion. During this period we observed two incidents where there was a sudden increase in the pulsar frequency. During these incidents, the fractional change in the frequency was 8×10-5 and 3×10-4. These glitches are larger than radio pulsar glitches and different from them in several important respects. However, they are substantially similar to an event recently reported in data from KS 1947+300. It is difficult to understand these events in terms of accretion-induced changes in the rotation so they may yet bear some relation to radio pulsar glitches. These observations suggest the need for better monitoring of accreting X-ray pulsars. This work is supported in part by a grant from NASA.
Baykal Ahmet
Heffner C. M.
Stark Michael James
Swank Jean H.
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