2006•arXiv (Cornell University)Open access
Discovery of 1122 Hz X-Ray Burst Oscillations from the Neutron-Star X-Ray Transient XTE J1739-285
P. Kaaret, Zachary Prieskorn, J. J. M. in ’t Zand, Søren K. Brandt, N. Lund, Sandro Mereghetti, Diego Götz, Erik Kuulkers, John A. Tomsick
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Abstract
We report the discovery of oscillations at 1122 +/- 0.3 Hz in an X-ray burst from the X-ray transient XTE J1739-285. The signal has a peak Leahy power of 42.8 and, after consideration of the number of trials, has a chance probability of occurrence of 4E-5 equivalent to a 4.2 sigma detection. The oscillation frequency suggests that XTE J1739-285 contains the fastest rotating neutron star yet found. We also found millisecond quasiperiodic oscillations in the persistent emission with frequencies ranging from 757 Hz to 862 Hz. We detected seven X-ray bursts and derive an upper limit on the source distance of about 10.6 kpc from the brightest burst.