论文标题
LMC Erassu J050810.4 $ - $ 660653中的新型高质量X射线二进制的首次表征
First characterization of a new High Mass X-ray Binary in LMC eRASSU J050810.4$-$660653 with SRG/ART-XC, NuSTAR and Swift
论文作者
论文摘要
我们根据SRG/ART-XC，Nustar和Swift/XRT Instruments的数据在2021年12月2021年5月2021年5月在2022年5月的Energy Fange in 0.5--79 KEV中，根据SRG/ART-XC，NUSTAR和SWIFT/XRT工具的数据，报告了最近发现的BE/X射线二进制二进制ERASSU J050810.4 $ - $ 660653的结果的结果和时间研究结果。在源光曲线中发现了$ 40.5781 \ pm 0.0004 $ s的脉动，脉冲分数随着能量而单调增加。根据对系统的长期监控，获得了$ \ sim38 $天的轨道时期的估计。源光谱可以通过在高能量下通过指数截止而修改的幂律模型很好地近似。脉冲相分辨光谱法显示了光谱参数的较大变化，具体取决于中子星旋转的相位。我们尚未发现与Erassu J050810.4 $ - $ 660653的相平均和相分辨光谱中的回旋子吸收线相关的任何功能。但是，使用不同的间接方法估计中子星磁场估计了几个$ 10^{13} $ g。根据发射区域的物理和几何特性，讨论了脉冲相位的硬度比的发现变化。
We report results of the first detailed spectral and temporal studies of the recently discovered Be/X-ray binary eRASSU J050810.4$-$660653 in LMC based on the data from the SRG/ART-XC, NuSTAR and Swift/XRT instruments obtained in December 2021 - May 2022 in a wide energy range of 0.5-79 keV. Pulsations with the period of $40.5781 \pm 0.0004$ s were found in the source light curve with the pulsed fraction monotonically increasing with the energy. An estimate of the orbital period of $\sim38$ days was obtained based on the long-term monitoring of the system. The source spectrum can be well approximated with a power-law model modified by an exponential cutoff at high energies. The pulse phase-resolved spectroscopy shows a strong variation of spectral parameters depending on the phase of a neutron star rotation. We have not found any features connected with the cyclotron absorption line both in the phase-averaged and phase-resolved spectra of eRASSU J050810.4$-$660653. However, the neutron star magnetic field was estimated around several $10^{13}$ G using different indirect methods. Discovered variations of the hardness ratio over the pulse phase is discussed in terms of physical and geometrical properties of the emitting region.
