A NuSTAR study of the 55 ks hard X-ray pulse-phase modulation in the magnetar 4U 0142+61

Makishima, Kazuo; Murakami, Hiroaki; Enoto, Teruaki; Nakazawa, K.

doi:10.1093/pasj/psy129

Cited by 21 publications

(23 citation statements)

References 20 publications

(34 reference statements)

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“…In the paper by Makishima et al (2018) our previous work (Grimani 2016) was mentioned to point out that our results were not in agreement with the NuSTAR observations. However, this is not the case.…”

Section: Implications Of a Keplearian Precessing Disc Surrounding 4u ...contrasting

confidence: 76%

“…The modulated X-ray emission at 55(27.5) ks observed with the NuSTAR experiment from 4U 0142+61 was explained in Makishima et al (2018) with a magnetar free precession induced by the star magnetic field of about 10 16 G. Nevertheless, this magnetic field value exceeds by far previous estimates reported in the literature of (4.75±0.02)×10 14 G (Güver et al 2008). Forced precession of a pulsar due to the action of a surrounding accretion or fallback disc was proposed by Tong et al (2020).…”

Section: Implications Of a Keplearian Precessing Disc Surrounding 4u ...mentioning

confidence: 94%

“…The presence of a disc was claimed around the AXP 4U 0142+61 on the basis of the Spitzer satellite observations and earlier data (Wang et al 2006;Ertan et al 2007). While this discovery was questioned in the literature (Durant & van Kerkwĳk 2006), the NuSTAR experiment detected an X-ray emission modulated at 55 ks, or half this value, from the same AXP (Makishima et al 2018). It is shown here that this modulation is compatible with the presence of a Keple-★ E-mail: catia.grimani@uniurb.it rian precessing disc with the characteristics observed by Wang et al (2006) hiding periodically the emission region.…”

Section: Introductionmentioning

confidence: 99%

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Clues from 4U 0142+61 on supernova fallback disc formation and precession

Grimani

2021

Preprint

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The NuSTAR experiment detected a hard X-ray emission (10-70 keV) with a period of 8.68917 s and a pulse-phase modulation at 55 ks, or half this value, from the anomalous X-ray pulsar (AXP) 4U 0142+61. It is shown here that this evidence is naturally explained by the precession of a Keplerian supernova fallback disc surrounding this AXP. It is also found that the precession of discs formed around young neutron stars at distances larger than those considered in the past, may constitute almost neglected sources of gravitational waves with frequencies belonging to the sensitivity bands of the future space interferometers LISA, ALIA, DECIGO and BBO. In this work the gravitational wave emission from precessing fallback discs possibly formed around young pulsars such as Crab in a region extending beyond 8×10 7 m from the pulsar surface is estimated. It is also evaluated the role that infrared radiation emission from circumpulsar discs may play in contributing to Inverse Compton Scattering of TeV energy positrons and electrons. Extensive observational campaigns of disc formation around young and middle aged pulsars may also contribute to solve the long-standing problem of a pulsar origin for the excess of positrons in cosmic rays observed near Earth above 7 GeV. In the near future the James Webb telescope, with unprecedented near and mid-infrared observation capabilities, may provide direct evidence of a large sample of supernova fallback discs.

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Section: Implications Of a Keplearian Precessing Disc Surrounding 4u ...contrasting

confidence: 76%

Section: Implications Of a Keplearian Precessing Disc Surrounding 4u ...mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Clues from 4U 0142+61 on supernova fallback disc formation and precession

Grimani

2021

Preprint

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“…And one fallback disk is indeed observed in the magnetar 4U 0142+61 (Wang et al 2006). Furthermore, in 4U 0142+61 possible signature of precession was also reported (Makishima et al 2014(Makishima et al , 2019. It may due to free precession of the central magnetar (Makishima et al 2019).…”

Section: Introductionmentioning

confidence: 69%

“…Furthermore, in 4U 0142+61 possible signature of precession was also reported (Makishima et al 2014(Makishima et al , 2019. It may due to free precession of the central magnetar (Makishima et al 2019). Considering that the magnetar also has a fallback disk, it is possible that the precession may due to forced precession by the fallback disk (like that in PSR 1828−11).…”

Section: Introductionmentioning

confidence: 76%

Periodicity in fast radio bursts due to forced precession by a fallback disk

Tong,

Wang,

Wang

2020

Preprint

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Recently, a 16-day periodicity in one fast radio burst is reported. We propose that this 16-day periodicity may due to forced precession of the neutron star by a fallback disk. When the rotation axis is misaligned with the normal direction of the disk plane, the neutron star will precess. The eccentricity of the neutron star may due to rotation or strong magnetic field etc. We found that the 16-day period may be understood using typical masses of the fallback disk. Polarization observations and information about the neutron star rotation period may help to discriminate different models. The possible precession observations in pulsars, magnetars, and fast radio bursts may be understood together using forced precession by a fallback disk.

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