论文标题
与成像X射线极化探索器的4U 1626-67观察
Observations of 4U 1626-67 with the Imaging X-ray Polarimetry Explorer
论文作者
论文摘要
我们使用来自Imaging X射线极化探险器（IXPE）的数据，介绍了从PULSAR的2-8 KEV带中X射线极化的测量值。在整个IXPE观测值以及更好的软X射线观测值中，清楚地检测到了7.66 S的脉动，我们将其用作定时分析的基础，并在0.4-10 KEV能量带上限制光谱形状。还获得了Chandra Hetg高分辨率X射线光谱，在IXPE观察时期进行企业光谱建模的时代。我们发现脉冲平均线性极化的上限<4％（置信度为95％）。同样，当通过能量细分带通孔时，在脉冲间隔中没有显着检测到极化通量。然而，在脉冲期间隔内在完整带通的整个带通道上的光谱模型提供了在4.8 +/- 2.3％水平（90％置信度）下幂律频谱分量极化的边际检测。我们讨论了关于吸积几何形状到脉冲星上的含义，这有利于脉冲发射的两组分模型。
We present measurements of the polarization of X-rays in the 2-8 keV band from the pulsar in the ultracompact low mass X-ray binary 4U1626-67 using data from the Imaging X-ray Polarimetry Explorer (IXPE). The 7.66 s pulsations were clearly detected throughout the IXPE observations as well as in the NICER soft X-ray observations, which we use as the basis for our timing analysis and to constrain the spectral shape over 0.4-10 keV energy band. Chandra HETGS high-resolution X-ray spectra were also obtained near the times of the IXPE observations for firm spectral modeling. We find an upper limit on the pulse-averaged linear polarization of <4% (at 95% confidence). Similarly, there was no significant detection of polarized flux in pulse phase intervals when subdividing the bandpass by energy. However, spectropolarimetric modeling over the full bandpass in pulse phase intervals provide a marginal detection of polarization of the power-law spectral component at the 4.8 +/- 2.3% level (90% confidence). We discuss the implications concerning the accretion geometry onto the pulsar, favoring two-component models of the pulsed emission.
