PHASE-RESOLVED NuSTAR AND SWIFT-XRT OBSERVATIONS OF MAGNETAR 4U 0142+61

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dc.contributor.authorTendulkar, Shriharsh P.
dc.contributor.authorHascoeet, Romain
dc.contributor.authorYang, Chengwei
dc.contributor.authorKaspi, Victoria M.
dc.contributor.authorBeloborodov, Andrei M.
dc.contributor.authorAn, Hongjun
dc.contributor.authorBachetti, Matteo
dc.contributor.authorBoggs, Steven E.
dc.contributor.authorChristensen, Finn E.
dc.contributor.authorCraig, William W.
dc.contributor.authorGuiilot, Sebastien
dc.contributor.authorHailey, Charles A.
dc.contributor.authorHarrison, Fiona A.
dc.contributor.authorStern, Daniel
dc.contributor.authorZhang, William
dc.date.accessioned2025-01-23T21:34:28Z
dc.date.available2025-01-23T21:34:28Z
dc.date.issued2015
dc.description.abstractWe 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 approximate to 20%, similar to that observed in 1E 1841-045 and much lower than the approximate to 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 Gamma(H) similar to 0.65, 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 e(+/-) outflow model of Beloborodov. Our results are consistent with the parameters of the active j-bundle derived from INTEGRAL data by Hascoet 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.
dc.fechaingreso.objetodigital2025-08-05
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-637X/808/1/32
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.1088/0004-637X/808/1/32
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101537
dc.identifier.wosidWOS:000359062500032
dc.issue.numeroNo. 1
dc.language.isoen
dc.nota.accesocontenido completo
dc.pagina.final13
dc.pagina.inicio1
dc.revistaAstrophysical Journal
dc.rightsacceso abierto
dc.subjectpulsars: individual (4U 0142+61)
dc.subjectstars: magnetars
dc.subjectstars: neutron
dc.subject.ods07 Affordable and clean energy
dc.subject.odspa07 Energía asequible y no contaminante
dc.titlePHASE-RESOLVED NuSTAR AND SWIFT-XRT OBSERVATIONS OF MAGNETAR 4U 0142+61
dc.typeartículo
dc.volumenVol. 808
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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