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- W3104428994 abstract "We report on the Neutron Star Interior Composition Explorer (NICER) monitoring campaign of the 468 Hz accreting millisecond X-ray pulsar IGR J17379-3747. From a detailed spectral and timing analysis of the coherent pulsations we find that they show a strong energy dependence, with soft thermal emission lagging about 640 microseconds behind the hard, Comptonized emission. Additionally, we observe uncommonly large pulse fractions, with measured amplitudes in excess of 20% sinusoidal fractional amplitude across the NICER passband and fluctuations of up to ~70%. Based on a phase-resolved spectral analysis, we suggest that these extreme properties might be explained if the source has an unusually favorable viewing geometry with a large magnetic misalignment angle. Due to these large pulse fractions, we were able to detect pulsations down to quiescent luminosities (~5 x 10^33 erg s^-1). We discuss these low-luminosity pulsations in the context of transitional millisecond pulsars." @default.
- W3104428994 created "2020-11-23" @default.
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- W3104428994 date "2019-05-28" @default.
- W3104428994 modified "2023-10-14" @default.
- W3104428994 title "On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379–3747" @default.
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- W3104428994 doi "https://doi.org/10.3847/1538-4357/ab1b26" @default.
- W3104428994 hasPublicationYear "2019" @default.
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