期刊
ASTROPHYSICAL JOURNAL
卷 954, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aced05
关键词
-
Recent joint observations with IXPE and XMMNewton of the soft.-repeater SGR 1806-20 revealed strong polarization in its X-ray emission, with the source found at an all-time low persistent flux level. The detection of probable polarization at 4-5 keV energy range suggests a resonance Compton scattering mechanism in the magnetosphere, similar to that proposed for another bright magnetar 4U 0142+61.
Recent observations with the Imaging X-ray Polarimetry Explorer (IXPE) of two anomalous X-ray pulsars provided evidence that X-ray emission from magnetar sources is strongly polarized. Here 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据