Observations of V0332+53 during the 2015 outburst using Fermi/GBM, MAXI, Swift and INTEGRAL

Baum, Zachary A.; Cherry, M. L.; Rodi, J.

doi:10.1093/mnras/stx384

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…The most recent giant outburst of the source took place in 2015, followed by a mini-outburst in 2016 (Cusumano et al 2016;Tsygankov et al 2016;Baum et al 2017). In Doroshenko et al (2017); Vybornov et al (2018) it was found that the above-mentioned anticorrelation between CRSF energy and luminosity breaks at low fluxes, suggesting the change in accretion regimes (from super-to sub-critical, see Basko & Sunyaev 1976;Mushtukov et al 2015a).…”

Section: System V 0332+53mentioning

confidence: 96%

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Pulsating iron spectral features in the emission of X-ray pulsar V0332+53

Bykov,

Filippova,

Gilfanov

et al. 2021

Preprint

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We present results of phase-and time-resolved study of iron spectral features in the emission of the Be/X-ray transient pulsar V 0332+53 during its type II outburst in 2004 using archival RXTE/PCA data. Coherent pulsations of both fluorescent iron line at ≈ 6.4 keV and neutral iron K-edge at ≈ 7.1 keV have been detected throughout the entire outburst. The pulsating iron K-edge is reported for the first time for this object. Near the peak of the outburst, the 3-12 keV pulse profile shows two deep, 𝐹 max /𝐹 min ∼ 2, and narrow dips of nearly identical shape, separated by exactly Δ𝜙 = 0.5 in phase. The dip spectra are nearly identical to each other and very similar in shape to the spectra outside the dips. The iron K-edge peaks at the phase intervals corresponding to the dips, although its optical depth 𝜏 𝐾 ∼ 0.05 is by far insufficient to explain the dips. The iron line shows pulsations with a complex pulse profile without any obvious correlation with the total flux or optical depth of the K-edge. Accounting for the component associated with reprocessing of the pulsar emission by the surface of the donor star and circumstellar material, we find a very high pulsation amplitude of the iron line flux, 𝐹 max /𝐹 min ∼ 10. We demonstrate that these properties of V 0332+53 can not be explained by contemporary emission models for accreting X-ray pulsars and speculate about the origin of the observed iron spectral features.

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Section: System V 0332+53mentioning

confidence: 96%

“…In our fits, the spectral width of the line was poorly constrained but had a value typically ∼ 0.3 ± 0.1 keV. Therefore we fixed the width at 0.3 keV, a value similar to the results of Caballero-García et al (2016); Baum et al (2017). With applied systematic errors (sect.…”

Section: Light Curve and Long-term Spectral Evolutionmentioning

confidence: 98%

Pulsating iron spectral features in the emission of X-ray pulsar V0332+53

Bykov,

Filippova,

Gilfanov

et al. 2021

Preprint

View full text Add to dashboard Cite

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Pulsating iron spectral features in the emission of X-ray pulsar V 0332+53

Bykov

Filippova

Gilfanov

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We present results of phase- and time-resolved study of iron spectral features in the emission of the Be/X-ray transient pulsar V 0332+53 during its type II outburst in 2004 using archival RXTE/PCA data. Coherent pulsations of both fluorescent iron line at ≈6.4 keV and neutral iron K-edge at ≈7.1 keV have been detected throughout the entire outburst. The pulsating iron K-edge is reported for the first time for this object. Near the peak of the outburst, the 3–12 keV pulse profile shows two deep, Fmax/Fmin ∼ 2, and narrow dips of nearly identical shape, separated by exactly Δφ = 0.5 in phase. The dip spectra are nearly identical to each other and very similar in shape to the spectra outside the dips. The iron K-edge peaks at the phase intervals corresponding to the dips, although its optical depth τK ∼ 0.05 is by far insufficient to explain the dips. The iron line shows pulsations with a complex pulse profile without any obvious correlation with the total flux or optical depth of the K-edge. Accounting for the component associated with reprocessing of the pulsar emission by the surface of the donor star and circumstellar material, we find a very high pulsation amplitude of the iron line flux, Fmax/Fmin ∼ 10. We demonstrate that these properties of V 0332+53 can not be explained by contemporary emission models for accreting X-ray pulsars and speculate about the origin of the observed iron spectral features.

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An investigation of the ‘10 keV feature’ in the spectra of accretion powered X-ray pulsars with NuSTAR

Manikantan,

Paul,

Rana

2023

Monthly Notices of the Royal Astronomical Society

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Some of the accreting X-ray pulsars are reported to exhibit a peculiar spectral feature at ∼10 keV, known as the ‘10 keV feature’. The feature has been characterized as either an emission line or an absorption line, and its origin is unknown. It has been found in multiple observations of the same source by different observatories, but not all the observations of any particular source consistently showed the presence of it. In this work, we have carried out a systematic investigation for the presence of the ‘10 keV feature’ using data from NuSTAR, a low background spectroscopic observatory having uninterrupted wide band coverage on either side of 10 keV. We performed a systematic spectral analysis on 58 archival NuSTAR observations of 30 bright X-ray pulsars. The 3–79 keV spectral continua of these selected sources were fitted with a model chosen on the basis of its fitting quality in 3–15 keV and model simplicity, and then inspected for the presence of the ‘10 keV feature’. Our analysis indicates the presence of such a feature in 16 out of 58 the NuSTAR observations of 11 different sources and is fitted with a Gaussian absorption model centred around 10 keV. Our analysis also suggests that such a feature could be wrongly detected if flare data is not analysed separately from persistent emission.

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Observations of V0332+53 during the 2015 outburst using Fermi/GBM, MAXI, Swift and INTEGRAL

Cited by 3 publications

References 33 publications

Pulsating iron spectral features in the emission of X-ray pulsar V0332+53

Pulsating iron spectral features in the emission of X-ray pulsar V0332+53

Pulsating iron spectral features in the emission of X-ray pulsar V 0332+53

An investigation of the ‘10 keV feature’ in the spectra of accretion powered X-ray pulsars with NuSTAR

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