Rodríguez Castillo, GA;
Israel, GL;
Tiengo, A;
Salvetti, D;
Turolla, R;
Zane, S;
Rea, N;
... Motta, S; + view all
(2016)
The outburst decay of the low magnetic field magnetar SWIFT J1822.3−1606: phase-resolved analysis and evidence for a variable cyclotron feature.
Monthly Notices of the Royal Astronomical Society
, 456
(4)
pp. 4145-4155.
10.1093/mnras/stv2490.
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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 days since the discovery of SWIFT J1822.3-1606 following the Swift-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.
Type: | Article |
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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 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stv2490 |
Publisher version: | http://doi.org/10.1093/mnras/stv2490 |
Language: | English |
Additional information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Keywords: | stars: neutron – stars: magnetar – star: individual (SWIFT J1822.3-16066) – X-rays: bursts |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/1508055 |
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