UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

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

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. Green open access

[thumbnail of Castillo_MNRAS-2016-Rodríguez Castillo-4145-55.pdf]
Preview
Text
Castillo_MNRAS-2016-Rodríguez Castillo-4145-55.pdf - Published Version

Download (3MB) | Preview

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
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
Downloads since deposit
Loading...
0Downloads
Download activity - last month
Loading...
Download activity - last 12 months
Loading...
Downloads by country - last 12 months
Loading...

Archive Staff Only

View Item View Item