Concise Spectrotemporal Studies of Magnetar SGR J1935+2154 Bursts

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dc.citation.articleNumber130en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber965en_US
dc.contributor.authorKeskin, Özgeen_US
dc.contributor.authorGöğüş, Ersinen_US
dc.contributor.authorKaneko, Yukien_US
dc.contributor.authorDemirer, Mustafaen_US
dc.contributor.authorYamasaki, Shotaroen_US
dc.contributor.authorBaring, Matthew G.en_US
dc.contributor.authorLin, Linen_US
dc.contributor.authorRoberts, Oliver J.en_US
dc.contributor.authorKouveliotou, Chryssaen_US
dc.date.accessioned2024-07-25T20:55:15Zen_US
dc.date.available2024-07-25T20:55:15Zen_US
dc.date.issued2024en_US
dc.description.abstractSGR J1935+2154 has truly been the most prolific magnetar over the last decade: it has been entering into burst active episodes once every 1–2 yr since its discovery in 2014, it emitted the first Galactic fast radio burst associated with an X-ray burst in 2020, and it has emitted hundreds of energetic short bursts. Here, we present the time-resolved spectral analysis of 51 bright bursts from SGR J1935+2154. Unlike conventional time-resolved X-ray spectroscopic studies in the literature, we follow a two-step approach to probe true spectral evolution. For each burst, we first extract spectral information from overlapping time segments, fit them with three continuum models, and employ a machine-learning-based clustering algorithm to identify time segments that provide the largest spectral variations during each burst. We then extract spectra from those nonoverlapping (clustered) time segments and fit them again with the three models: the cutoff power-law model, the sum of two blackbody functions, and the model considering the emission of a modified blackbody undergoing resonant cyclotron scattering, which is applied systematically at this scale for the first time. Our novel technique allowed us to establish the genuine spectral evolution of magnetar bursts. We discuss the implications of our results and compare their collective behavior with the average burst properties of other magnetars.en_US
dc.identifier.citationKeskin, Ö., Göğüş, E., Kaneko, Y., Demirer, M., Yamasaki, S., Baring, M. G., Lin, L., Roberts, O. J., & Kouveliotou, C. (2024). Concise Spectrotemporal Studies of Magnetar SGR J1935+2154 Bursts. The Astrophysical Journal, 965(2), 130. https://doi.org/10.3847/1538-4357/ad2fceen_US
dc.identifier.digitalKeskin_2024_ApJ_965_130en_US
dc.identifier.doihttps://doi.org/10.3847/1538-4357/ad2fceen_US
dc.identifier.urihttps://hdl.handle.net/1911/117496en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
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.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleConcise Spectrotemporal Studies of Magnetar SGR J1935+2154 Burstsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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