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2009•UvA-DARE (University of Amsterdam)Requires access

Discovery of 245 Hz burst oscillations from the accreting millisecond pulsar IGR J17511-3057

Anna L. Watts, D. Altamirano, Craig B. Markwardt, Tod E. Strohmayer

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Abstract

RXTE observations of the bursting accreting millisecond X-ray pulsar IGR J17511-3057 (ATEL #2196, #2197, #2198) showed a short Type I X-ray burst on September 14th 2009. We detect strong burst oscillations at 245 Hz, very close to the spin frequency. Maximum Leahy power is in the range 130-215 in 3 independent consecutive 4s bins during the burst (using all photons in the 2-60 keV band), putting the detection beyond doubt. Burst oscillation amplitude exceeds 10% rms in this energy band.

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What this paper is about

RXTE observations of the bursting accreting millisecond X-ray pulsar IGR J17511-3057 (ATEL #2196, #2197, #2198) showed a short Type I X-ray burst on September 14th 2009. We detect strong burst oscillations at 245 Hz, very close to the spin frequency. Maximum Leahy power is in the range 130-215 in 3 independent consecutive 4s bins during the burst (using all photons in the 2-60 keV band), putting the detection beyond doubt. Burst oscillation amplitude exceeds 10% rms in this energy band.

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Available abstract

RXTE observations of the bursting accreting millisecond X-ray pulsar IGR J17511-3057 (ATEL #2196, #2197, #2198) showed a short Type I X-ray burst on September 14th 2009. We detect strong burst oscillations at 245 Hz, very close to the spin frequency. Maximum Leahy power is in the range 130-215 in 3 independent consecutive 4s bins during the burst (using all photons in the 2-60 keV band), putting the detection beyond doubt. Burst oscillation amplitude exceeds 10% rms in this energy band.

Key concepts: Physics, Bursting, Astrophysics, Millisecond pulsar, Pulsar, Millisecond, Amplitude, Oscillation (cell signaling)

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