Quasiperiodic Peak Energy Oscillations in X-Ray Bursts from SGR J1935+2154

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dc.citation.articleNumberL27
dc.citation.journalTitleThe Astrophysical Journal Letters
dc.citation.volumeNumber956
dc.contributor.authorRoberts, Oliver J.
dc.contributor.authorBaring, Matthew G.
dc.contributor.authorHuppenkothen, Daniela
dc.contributor.authorKouveliotou, Chryssa
dc.contributor.authorGöğüş, Ersin
dc.contributor.authorKaneko, Yuki
dc.contributor.authorLin, Lin
dc.contributor.authorHorst, Alexander J. van der
dc.contributor.authorYounes, George
dc.date.accessioned2024-05-03T15:51:08Z
dc.date.available2024-05-03T15:51:08Z
dc.date.issued2023
dc.description.abstractMagnetars are young neutron stars powered by the strongest magnetic fields in the Universe (1013–15 G). Their transient X-ray emission usually manifests as short (a few hundred milliseconds), bright, energetic (∼1040–41 erg) X-ray bursts. Since its discovery in 2014, SGR J1935+2154 has become one of the most prolific magnetars, exhibiting very active bursting episodes and other fascinating events, such as pulse timing antiglitches and fast radio bursts. Here we present evidence for possible 42 Hz (24 ms) quasiperiodic oscillations in the ν F ν spectrum peak energy (E p ) identified in a unique burst detected with the Fermi Gamma-ray Burst Monitor in 2022 January. While quasiperiodic oscillations have been previously reported in the intensity of magnetar burst light curves, quasiperiodic oscillations in E p have not. We also find an additional event from the same outburst that appears to exhibit a similar character in E p , albeit of lower statistical quality. For these two exceptional transients, such E p oscillations can be explained by magnetospheric density and pressure perturbations. For burst-emitting plasma consisting purely of e + e − pairs, these acoustic modes propagate along a highly magnetized flux tube of length up to around L ∼ 130 neutron star radii, with L being lower if ions are present in the emission zone. Detailed time-resolved analyses of other magnetar bursts are encouraged to evaluate the rarity of these events and their underlying mechanisms.
dc.identifier.citationRoberts, O. J., Baring, M. G., Huppenkothen, D., Kouveliotou, C., Göğüş, E., Kaneko, Y., Lin, L., Horst, A. J. van der, & Younes, G. (2023). Quasiperiodic Peak Energy Oscillations in X-Ray Bursts from SGR J1935+2154. The Astrophysical Journal Letters, 956(1), L27. https://doi.org/10.3847/2041-8213/acfcad
dc.identifier.digitalRoberts_2023_ApJL_956_L27
dc.identifier.doihttps://doi.org/10.3847/2041-8213/acfcad
dc.identifier.urihttps://hdl.handle.net/1911/115538
dc.language.isoeng
dc.publisherIOP Publishing Ltd
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleQuasiperiodic Peak Energy Oscillations in X-Ray Bursts from SGR J1935+2154
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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