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- W3100809263 abstract "We present temporal and spectral analysis of simultaneous 0.5–79 keV Swift-XRT and Nuclear Spectroscopic Telescope Array observations of the magnetar 4U 0142+61. The pulse profile changes significantly with photon energy between 3 and 35 keV. The pulse fraction increases with energy, reaching a value of ≈20%, similar to that observed in 1E 1841–045 and much lower than the ≈80% pulse fraction observed in 1E 2259+586. We do not detect the 55 ks phase modulation reported in previous Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV is dominated by a hard power law (PL) with a photon index , and the spectrum below 20 keV can be described by two blackbodies, a blackbody plus a soft PL, or by a Comptonized blackbody model. We study the full phase-resolved spectra using the outflow model of Beloborodov. Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoët et al. We find that a significant degeneracy appears in the inferred parameters if the footprint of the j-bundle is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced when the footprint is required to be the hot spot inferred from the soft X-ray data." @default.
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- W3100809263 date "2015-07-16" @default.
- W3100809263 modified "2023-10-12" @default.
- W3100809263 title "PHASE-RESOLVED<i>NuSTAR</i>AND<i>SWIFT</i>-XRT OBSERVATIONS OF MAGNETAR 4U 0142+61" @default.
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- W3100809263 doi "https://doi.org/10.1088/0004-637x/808/1/32" @default.
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