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arXiv 2512.09448astro-ph.HE
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X射线偏振与极化变化在极端高同步辐射峰值BLLAR 1ES 1101--232中

X-ray Polarization and Spectral Variations in an Extreme High-Synchrotron-Peaked Blazar 1ES 1101--232

Beijing Institute of Technology(北京理工大学);Guangxi University(广西大学)

Xin-Ke Hu, Jin Zhang, Fei Xie, Xiang-Gao Wang

AI总结:

研究首次利用IXPE观测到BLLAR 1ES 1101--232的X射线偏振,发现其偏振度高达38.9%,并揭示了其X射线谱的软到硬演变及磁场有序性。

摘要:

我们首次对极端高同步辐射峰值BLLAR 1ES 1101--232进行了X射线偏振观测,由成像X射线偏振探测器(IXPE)进行。数据分析结合了Swift-XRT和NuSTAR的同时和近似同时观测。我们的结果揭示了在2-6 keV波段,X射线偏振在置信度水平(CL)为6.6σ的情况下显著检测到,偏振度为Π_X=17.9%±2.7%,电矢量位置角(EVPA)为ψ_X=10°.0±4°.4。在更窄的时间间隔内,观测到更高的偏振度为Π_X=38.9%±9.1%,EVPA为ψ_X=13°.9±6°.7,置信度水平为4.3σ。在IXPE观测期间,1ES 1101--232的X射线谱在0.3-10 keV波段表现出明显的软到硬谱演变,尽管没有检测到显著的流量变化。此外,在流量-光子指数平面中识别出一个顺时针的滞后环。这些发现共同表明,1ES 1101--232的X射线辐射起源于一个具有良好有序磁场区域的同步辐射区域。

英文摘要:

We present the first X-ray polarimetric observation of the extreme high-synchrotron-peaked blazar 1ES 1101--232, conducted by the Imaging X-ray Polarimetry Explorer (IXPE). The data analysis incorporates simultaneous and quasi-simultaneous observations from Swift-XRT and NuSTAR. Our results reveal a significant detection of X-ray polarization in the 2--6 keV band at a confidence level (CL) of 6.6$σ$, with a polarization degree of $Π_{\rm X}=17.9\%\pm2.7\%$ and an electric vector position angle (EVPA) of $ψ_{\rm X}=10^\circ.0\pm4^\circ.4$. An even higher polarization degree of $Π_{\rm X}=38.9\%\pm9.1\%$ with an EVPA of $ψ_{\rm X}=13^\circ.9\pm6^\circ.7$ is observed within a narrower time interval, at a CL of 4.3$σ$. During the IXPE observational campaign, the X-ray spectrum of 1ES 1101--232 exhibits a clear soft-to-hard spectral evolution in the 0.3--10 keV band, although no significant flux variability is detected. Additionally, a clockwise hysteresis loop is identified in the flux--photon index plane. These findings collectively indicate that the X-ray emission from 1ES 1101--232 originates in a region characterized by a well-ordered magnetic field through synchrotron radiation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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