IXPE and XMM-Newton Observations of the Soft Gamma Repeater SGR 1806-20

0576951 - ASÚ 2024 RIV GB eng J - Journal Article
Turolla, R. - Taverna, R. - Israel, G. L. - Dovčiak, Michal - Karas, Vladimír … Total 99 authors
IXPE and XMM-Newton Observations of the Soft Gamma Repeater SGR 1806-20.
Astrophysical Journal. Roč. 954, č. 1 (2023), č. článku 88. ISSN 0004-637X. E-ISSN 1538-4357
Institutional support: RVO:67985815
Keywords : neutron stars * magnetars * polarimetry
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.9, year: 2022
Method of publishing: Open access

We report on the joint IXPE and XMMNewton observations of the soft.-repeater SGR 1806-20. The spectral and timing properties of SGR 1806-20 derived from XMM-Newton data are in broad agreement with previous measurements, however, we found the source at an alltime low persistent 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.degrees 0)(+. 15.degrees 0) was obtained. The resulting polarization signal, together with the upper limits we derive at lower and higher energies (2-4 and 5-8 keV, respectively), is compatible with a picture in which thermal radiation from the condensed star surface is reprocessed by resonant Compton scattering in the magnetosphere, similar to what was proposed for the bright magnetar 4U 0142+61.
Permanent Link: https://hdl.handle.net/11104/0347332