<i>NuSTAR</i> OBSERVATIONS OF MAGNETAR 1E 1048.1-5937

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dc.contributor.authorYang, C.
dc.contributor.authorArchibald, R. F.
dc.contributor.authorVogel, J. K.
dc.contributor.authorAn, H.
dc.contributor.authorKaspi, V. M.
dc.contributor.authorGuillot, S.
dc.contributor.authorBeloborodov, A. M.
dc.contributor.authorPivovaroff, M.
dc.date.accessioned2025-01-23T21:28:03Z
dc.date.available2025-01-23T21:28:03Z
dc.date.issued2016
dc.description.abstractWe report on simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR) and XMM-Newton observations of the magnetar 1E. 1048.1-5937, along with Rossi X-ray Timing Explorer (RXTE) data for the same source. The NuSTAR data provide a clear detection of this magnetar's persistent emission up to 20 keV. We detect a previously unreported small secondary peak in the average pulse profile in the 7-10 keV band, which grows to an amplitude comparable to that of the main peak in the 10-20 keV band. We show using RXTE data that this secondary peak is likely transient. We find that the pulsed fraction increases with energy from a value of similar to 0.55 at similar to 2. keV to a value of similar to 0.75 near 8. keV but shows evidence of decreasing at higher energies. After filtering out multiple bright X-ray bursts during the observation, we find that the phase-averaged spectrum from combined NuSTAR and XMM data is well described by an absorbed double blackbody plus power-law model, with no evidence for the spectral turn-up near similar to 10. keV as has been seen in some other magnetars. Our data allow us to rule out a spectral turn-up similar to those seen in magnetars 4U 0142+61 and 1E 2259+586 of Delta Gamma greater than or similar to 2, where Delta Gamma is the difference between the soft-band and hard-band photon indexes. The lack of spectral turn-up is consistent with what has been observed from an active subset of magnetars given previously reported trends suggesting that the degree of spectral turn-up is correlated with spin-down rate and/or spin-inferred magnetic field.
dc.fuente.origenWOS
dc.identifier.doi10.3847/0004-637X/831/1/80
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/0004-637X/831/1/80
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/101398
dc.identifier.wosidWOS:000387788600023
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectpulsars: general
dc.subjectpulsars: individual (1E 1048.1)
dc.subjectstars: magnetars
dc.subjectstars: magnetic field
dc.subjectstars: neutron
dc.subjectX-rays: stars
dc.title<i>NuSTAR</i> OBSERVATIONS OF MAGNETAR 1E 1048.1-5937
dc.typeartículo
dc.volumen831
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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