SIMBAD references

2019ApJ...877...70B - Astrophys. J., 877, 70-70 (2019/June-1)

On the curious pulsation properties of the accreting millisecond pulsar IGR J17379-3747.

BULT P., MARKWARDT C.B., ALTAMIRANO D., ARZOUMANIAN Z., CHAKRABARTY D., GENDREAU K.C., GUILLOT S., JAISAWAL G.K., RAY P.S. and STROHMAYER T.E.

Abstract (from CDS):

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 µs 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 (∼5×1033 erg s–1). We discuss these low-luminosity pulsations in the context of transitional millisecond pulsars.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: neutron - X-rays: binaries - X-rays: individual: IGR J17379-3747

Simbad objects: 7

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2021.06.25-14:27:54

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