论文标题
Nustar发现了GRO J1750-27中的回旋线线
NuSTAR discovery of a cyclotron line in GRO J1750-27
论文作者
论文摘要
GRO J1750-27在1995年爆发时发现了CGRO-BATSE，是最众所周知的银河BE-X射线二元系统之一。这个相对较差的系统最近在2021年9月爆发了。在爆发的上升阶段，使用Nustar望远镜在最新爆发期间观察到了来源。我们使用在3至65 KeV之间产生的能量分辨脉冲图谱估计源的自旋周期为4.45 s。我们发现该轮廓在低能（<18 keV）下是双峰，同时在更高的能量（> 18 keV）中演变成单个峰。该来源的宽带频谱非常适合高能截止幂律模型，我们报告了该源在43 keV中的气旋共振散射功能（CRSF）的发现，表明使用磁场强度的磁场强度估计了磁场的估计，这表明磁场强度为$ 3.7 \ times 10^{12^{12} $ g。前爆发期间的通量。
GRO J1750-27, discovered during an outburst in 1995 with CGRO-BATSE, is one of the farthest known galactic Be-X-ray binary systems. This relatively poorly studied system recently went into an outburst in September 2021. The source was observed during the latest outburst using the NuSTAR telescope during the rising phase of the outburst. We estimate the spin period of the source to be 4.45 s using which we produced energy-resolved pulse profiles between 3 and 65 keV. We find that the profile is double-peaked at low energies (<18 keV) while evolving into a single peak at higher energies (>18 keV). The broadband spectrum of this source was fitted well with a high energy cutoff power-law model and we report the discovery of a cyclotron resonant scattering feature (CRSF) in this source at 43 keV, indicating a magnetic field strength of $3.7 \times 10^{12}$ G. Our estimate of the magnetic field strength using the cyclotron line is consistent with the estimates made earlier using the accretion torque model from measurements of spin-up rates and fluxes during the previous outbursts.
