The outburst decay of the low magnetic field magnetar SWIFT J1822.3−1606: phase-resolved analysis and evidence for a variable cyclotron feature

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Title: The outburst decay of the low magnetic field magnetar SWIFT J1822.3−1606: phase-resolved analysis and evidence for a variable cyclotron feature
Authors: Rodríguez Castillo, Guillermo A. | Israel, Gian Luca | Tiengo, Andrea | Salvetti, David | Turolla, Roberto | Zane, Silvia | Rea, Nanda | Esposito, Paolo | Mereghetti, Sandro | Perna, Rosalba | Stella, Luigi | Pons, José A. | Campana, Sergio | Götz, Diego | Motta, Sara
Research Group/s: Astrofísica Relativista
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Stars: individual: SWIFT J1822.3−16066 | Stars: magnetar | Stars: neutron | X-rays: bursts
Knowledge Area: Astronomía y Astrofísica
Issue Date: 11-Mar-2016
Publisher: Oxford University Press
Citation: Monthly Notices of the Royal Astronomical Society. 2016, 456(4): 4145-4155. doi:10.1093/mnras/stv2490
Abstract: We study the timing and spectral properties of the low-magnetic field, transient magnetar SWIFT J1822.3−1606 as it approached quiescence. We coherently phase-connect the observations over a time-span of ∼500 d since the discovery of SWIFT J1822.3−1606 following the Swift-Burst Alert Telescope (BAT) trigger on 2011 July 14, and carried out a detailed pulse phase spectroscopy along the outburst decay. We follow the spectral evolution of different pulse phase intervals and find a phase and energy-variable spectral feature, which we interpret as proton cyclotron resonant scattering of soft photon from currents circulating in a strong (≳1014 G) small-scale component of the magnetic field near the neutron star surface, superimposed to the much weaker (∼3 × 1013 G) magnetic field. We discuss also the implications of the pulse-resolved spectral analysis for the emission regions on the surface of the cooling magnetar.
URI: http://hdl.handle.net/10045/52488
ISSN: 0035-8711 (Print) | 1365-2966 (Online)
DOI: 10.1093/mnras/stv2490
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1093/mnras/stv2490
Appears in Collections:INV - Astrofísica Relativista - Artículos de Revistas

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