Evidence of 1122 Hz X-ray burst oscillations from the neutron star X-ray transient XTE J1739-285

P. Kaaret, Z. Prieskorn, J.J.M. in 't Zand, Søren Kristian Brandt, Niels Lund, S. Mereghetti, D. Gotz, E. Kuulkers, J.A. Tomsick

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Abstract

We report on millisecond variability from the X-ray transient XTE J1739-285. We detected six X-ray type I bursts and found evidence for oscillations at 1122 +/- 0.3 Hz in the brightest X-ray burst. Taking into consideration the power in the oscillations and the number of trials in the search, the detection is significant at the 99.96% confidence level. If the oscillations are confirmed, the oscillation frequency would suggest that XTE J1739-285 contains the fastest rotating neutron star yet found. We also found millisecond quasi-periodic oscillations in the persistent emission with frequencies ranging from 757 to 862 Hz. Using the brightest burst, we derive an upper limit on the source distance of about 10.6 kpc.
Original languageEnglish
JournalAstrophysical Journal
Volume657
Issue number2
Pages (from-to)L97-L100
ISSN0004-637X
Publication statusPublished - 2007

Keywords

  • stars : individual (XTE J1739-285)
  • accretion, accretion disks
  • gravitation
  • X-rays : stars
  • relativity
  • stars : neutron

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