Turolla, Roberto;
Taverna, Roberto;
Israel, Gian Luca;
Muleri, Fabio;
Zane, Silvia;
Bachetti, Matteo;
Heyl, Jeremy;
(2023)
IXPE and XMM-Newton observations of the Soft Gamma Repeater SGR 1806–20.
The Astrophysical Journal
, 954
(1)
, Article 88.
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Abstract
Recent observations with the Imaging X-ray Polarimetry Explorer (IXPE) of two anomalous X-ray 87 pulsars provided evidence that X-ray emission from magnetar sources is strongly polarized. Here 88 we report on the joint IXPE and XMM-Newton observations of the soft γ-repeater SGR 1806–20. 89 The spectral and timing properties of SGR 1806–20 derived from XMM-Newton data are in broad 90 agreement with previous measurements; however, we found the source at an all-time-low persistent 91 flux level. No significant polarization was measured apart from the 4–5 keV energy range, where a probable detection with PD = 31.6 ± 10.5% and PA = −17◦ .6 +15◦ .5 −15◦ 92 .0 was obtained. The resulting 93 polarization signal, together with the upper limits we derive at lower and higher energies (2–4 and 94 5–8 keV, respectively) is compatible with a picture in which thermal radiation from the condensed star 95 surface is reprocessed by resonant Compton scattering in the magnetosphere, similar to what proposed 96 for the bright magnetar 4U 0142+61.
| Type: | Article |
|---|---|
| Title: | IXPE and XMM-Newton observations of the Soft Gamma Repeater SGR 1806–20 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | http://doi.org/10.3847/1538-4357/aced05 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Stars:magnetars-techniques: polarimetric |
| 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/10174566 |
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