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On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379-3747
- Source :
- Bult, P, Markwardt, C B, Altamirano, D, Arzoumanian, Z, Chakrabarty, D, Gendreau, K C, Guillot, S, Jaisawal, G K, Ray, P S & Strohmayer, T E 2019, ' On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379-3747 ', Astrophysical Journal, vol. 877, no. 2, 70 . https://doi.org/10.3847/1538-4357/ab1b26, Astrophys.J., Astrophys.J., 2019, 877 (2), pp.70. ⟨10.3847/1538-4357/ab1b26⟩
- Publication Year :
- 2019
-
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.<br />16 pages, 8 figures, 3 tables. Accepted for publication in ApJ
- Subjects :
- 010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Context (language use)
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
X-rays: binaries
stars: neutron
Pulsar
Millisecond pulsar
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
individual (IGR J17379-3747) [X-rays]
010303 astronomy & astrophysics
0105 earth and related environmental sciences
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics
Millisecond
Neutron Star Interior Composition Explorer
Static timing analysis
Astronomy and Astrophysics
neutron [Stars]
Pulse (physics)
Amplitude
Space and Planetary Science
binaries [X-rays]
Astrophysics - High Energy Astrophysical Phenomena
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
X-rays: individual
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Bult, P, Markwardt, C B, Altamirano, D, Arzoumanian, Z, Chakrabarty, D, Gendreau, K C, Guillot, S, Jaisawal, G K, Ray, P S & Strohmayer, T E 2019, ' On the Curious Pulsation Properties of the Accreting Millisecond Pulsar IGR J17379-3747 ', Astrophysical Journal, vol. 877, no. 2, 70 . https://doi.org/10.3847/1538-4357/ab1b26, Astrophys.J., Astrophys.J., 2019, 877 (2), pp.70. ⟨10.3847/1538-4357/ab1b26⟩
- Accession number :
- edsair.doi.dedup.....06498e24ae2b15cbd22934581980d353