论文标题
在HMXB GRO J1750-27中发现回旋和狭窄的Fe K $_α$行
Discovery of cyclotron and narrow Fe K$_α$ lines in HMXB GRO J1750-27
论文作者
论文摘要
我们通过使用核光谱望远镜阵列（NUSTAR）观察到瞬态的定时和光谱分析为X射线Pulsar GRO J1750-27。这是自1995年以来的第四次爆发。自1995年以来，NUSTAR观察是在爆发爆发阶段进行的。在3-60 KEV能量范围内观察到4.450710（1）s的脉动。平均脉冲轮廓由一个宽峰和弱次级峰的宽峰组成，该峰会随着能量而演变而成。在此观察过程中，我们没有发现X射线发射的任何明显变化。宽带相平均光谱由黑体，PowerLaw或Comptonization成分描述。我们报告了6.4 keV的Fe K $_α$线的发现，以及在36和42 KEV附近的两个回旋共振散射功能的存在。这些线表示磁场强度为$ 3.7 _ { - 0.3}^{+0.1} \ times 10^{12} $和$ 4.4 \ pm 0.1 \ pm 0.1 \ times 10^{12} $ g用于中子星。我们估计，基于积聚盘扭矩型号的$ \ sim $ \ sim $ 13.6-16.4 kpc。
We report on timing and spectral analysis of transient Be X-ray pulsar GRO J1750-27 by using the Nuclear Spectroscopic Telescope Array (NuSTAR) observation from September 2021. This is the fourth outburst of the system since 1995. The NuSTAR observation was performed during the rising phase of the outburst. Pulsations at a period of 4.450710(1) s were observed in the 3-60 keV energy range. The average pulse profile comprised of a broad peak with a weak secondary peak which evolved with energy. We did not find any appreciable variation in the X-ray emission during this observation. The broad-band phase-averaged spectrum is described by a blackbody, a powerlaw or Comptonization component. We report discovery of Fe K$_α$ line at 6.4 keV along with presence of two cyclotron resonant scattering features around 36 and 42 keV. These lines indicate a magnetic field strength of $3.7_{-0.3}^{+0.1} \times 10^{12}$ and $4.4 \pm 0.1 \times 10^{12}$ G for the neutron star. We have estimated a source distance of $\sim$ 13.6-16.4 kpc based on the accretion-disc torque models.
