论文标题
更新的旋转和轨道参数以及吸收毫秒的X射线脉冲脉冲脉冲IGR J17591 $ -2342
Updated Spin and Orbital Parameters and Energy Dependent Pulse Behaviors of the Accreting Millisecond X-ray Pulsar IGR J17591$-$2342
论文作者
论文摘要
我们介绍了通过PULSAR时机和分析其依赖能量脉冲行为的新发现的新发现的毫秒X射线PULSAR（AMXP）IGR J17591 $ -2342的旋转和轨道参数的作品。通过中子星的内部组成探索器（NIC）收集了分析的数据，该数据从2018年8月至10月观察到了AMXP。使用脉冲到达时间延迟技术，评估了更准确的自旋和轨道参数。从测得的自旋频率导数中，估计IGR J17591 $ - $ 2342中的中子星的磁场约为$ 4 \ times 10^{8} $G。可以使用更新的旋转和轨道参数制成精确的脉冲轮廓。通常在其他AMXP中可以看到的软相位滞后现象也可以从$ \ sim $ 4 keV到12 keV，值为0.06个周期（1.14 $μ$ s）。此外，脉冲分数振幅从1 keV增加到$ \ sim $ 5 keV，然后减少了较高的能带。我们发现，这些现象以及能量谱可以通过具有相对强的黑体组件和额外的脉冲磁盘黑体组件的两个组件模型来解释。
We present our works in updating the spin and orbital parameters for the newly discovered accreting millisecond X-ray pulsar (AMXP) IGR J17591$-$2342 through pulsar timing and analyzing its energy dependent pulse behaviors. The data being analyzed were collected by Neutron Star Interior Composition ExploreR (NICER) that observed this AMXP from August to October 2018. Using the pulse arrival time delay technique, more accurate spin and orbital parameters were evaluated. From the measured spin frequency derivative, it is estimated that the magnetic field of the neutron star in IGR J17591$-$2342 is approximately $4 \times 10^{8}$ G. Precise pulse profiles can be made using the updated spin and orbital parameters. The soft phase lag phenomenon that is usually seen in other AMXPs is also observed from $\sim$4 keV to 12 keV with a value of 0.06 cycles (1.14 $μ$s). Additionally, the pulsed fractional amplitude increases from 1 to $\sim$5 keV and then decreases for higher energy bands. We found that these phenomena, as well as the energy spectrum, can be explained by the two-component model with a relatively strong blackbody component and an additional unpulsed disk blackbody component.
