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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8386
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dc.contributor.authorDevaraj, Ashwin-
dc.contributor.authorPaul, Biswajit-
dc.contributor.authorBhalerao, Varun-
dc.contributor.authorMukherjee, Dipanjan-
dc.date.accessioned2025-03-25T11:08:35Z-
dc.date.available2025-03-25T11:08:35Z-
dc.date.issued2025-03-10-
dc.identifier.citationThe Astrophysical Journal, 2025, Vol. 981, p205en_US
dc.identifier.urihttp://hdl.handle.net/2289/8386-
dc.descriptionOpen Accessen_US
dc.description.abstractIn 2020 November, A0535+26 underwent one of its brightest outbursts, reaching nearly 12 Crab in X-ray flux. Observed by Insight-HXMT, NuSTAR, NICER, and AstroSat, this event provided valuable insights into Be/X-ray binaries. The pulse profiles evolved significantly with luminosity, transitioning from pencil-beam to fan-beam geometries. A0535+26, known for its fundamental cyclotron line at ∼44 keV, became only the second source to exhibit a negative correlation between cyclotron line energy and flux at high luminosities, with a plateau phase preceding the transition from positive to negative correlation. We report the discovery of a phase-transient low-energy cyclotron line, detected in a narrow phase range (∼16%) across all seven NuSTAR observations during the rising, peak, and declining phases of the outburst. The new line exhibited dramatic variations with pulse phase and luminosity. We explain this behavior using an accretion geometry where the accretion column sweeps across the line of sight.en_US
dc.language.isoenen_US
dc.publisherIOP Publishing Ltden_US
dc.relation.urihttps://arxiv.org/abs/2501.15537en_US
dc.relation.urihttps://inspirehep.net/literature/2872694en_US
dc.relation.urihttps://ui.adsabs.harvard.edu/abs/2025ApJ...981..205D/abstracten_US
dc.relation.urihttps://doi.org/10.3847/1538-4357/adb0c2en_US
dc.rights2025 The Author(s)en_US
dc.subjectx-ray binary starsen_US
dc.subjecthigh mass x-ray binary starsen_US
dc.subjectx-ray astronomyen_US
dc.subjectbinary pulsarsen_US
dc.subjectneutron starsen_US
dc.titleDiscovery of a New Phase-transient Cyclotron Line in A0535+26: Constraints on the Accretion Geometryen_US
dc.typeArticleen_US
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