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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Título: | 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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Autor/es: | 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 |
Grupo/s de investigación o GITE: | Astrofísica Relativista |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física Aplicada |
Palabras clave: | Stars: individual: SWIFT J1822.3−16066 | Stars: magnetar | Stars: neutron | X-rays: bursts |
Área/s de conocimiento: | Astronomía y Astrofísica |
Fecha de publicación: | 11-mar-2016 |
Editor: | Oxford University Press |
Cita bibliográfica: | Monthly Notices of the Royal Astronomical Society. 2016, 456(4): 4145-4155. doi:10.1093/mnras/stv2490 |
Resumen: | 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 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1093/mnras/stv2490 |
Aparece en las colecciones: | INV - Astrofísica Relativista - Artículos de Revistas |
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2016_Rodriguez_etal_MNRAS.pdf | 3,08 MB | Adobe PDF | Abrir Vista previa | |
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