Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...535l.123c&link_type=abstract
The Astrophysical Journal, Volume 535, Issue 2, pp. L123-L127.
Astronomy and Astrophysics
Astronomy
38
Stars: Binaries: General, Relativity, Stars: Individual: Alphanumeric: Xte J1859+226, Stars: Oscillations, X-Rays: Stars
Scientific paper
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.
Cui Wei-Wei
Haswell Carole A.
Hynes Robert I.
Shrader Chris R.
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