Detection of Excess High-Frequency Power from the Rapid Burster

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We have detected an excess of high-frequency power associated with type II X-ray bursts from the Rapid Burster, MXB 1730-335. Detected signal frequencies range from 200 to 1777 Hz, with signal widths from 0.25 to 4.0 Hz and rms modulations in the 5.5--8.0 keV energy range of 10% to 25%. Two of the signals are individually significant at a >3sigma level of confidence. These detections represent the first high frequency (>100 Hz) power seen from the Rapid Burster. The power excess is seen exclusively during type II bursts, and may be related to the spasmodic accretion process that powers these bursts.

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