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Discovery of High-Frequency Quasi-periodic Oscillations in the Black Hole Candidate XTE J1859+226

Cui, Wei; Shrader, Chris R.; Haswell, Carole. A. and Hynes, Robert I. (2000). Discovery of High-Frequency Quasi-periodic Oscillations in the Black Hole Candidate XTE J1859+226. Astrophysical Journal, 535 L123-L127.

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We report the discovery of quasi-periodic oscillations (QPOs) at roughly 187 and 150 Hz in the X-ray intensity of X-ray nova XTE J1859+226. The source was observed during a recent outburst with the Rossi X-Ray Timing Explorer. Besides these high-frequency QPOs, we have also detected QPOs (and sometimes their harmonics) at 6–7 Hz and significant broadband variability at low frequencies. These properties, as well as the observed hard X-ray spectrum, make XTE J1859+226 a black hole candidate (BHC). The detection of QPOs at two distinct frequencies 100 Hz in two observations separated by about 4 hr provide additional insights into the high-frequency QPO phenomenon in BHCs. The importance lies in the proposed interpretations, which invariably involve the effects of strong gravity near a black hole. We compare our results to those of other BHCs and discuss the impact of the observational data on the models in a global context.

Item Type: Journal Article
ISSN: 1538-4357
Keywords: binaries: general—relativity—stars: individual (XTE J18591226)—stars: oscillations— X-rays: stars
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 11094
Depositing User: Astrid Peterkin
Date Deposited: 25 Jul 2008 11:03
Last Modified: 02 Dec 2010 20:09
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