论文标题
在4U 1700-37中可能检测新的Cyclotron功能
Possible detection of a new cyclotron feature in 4U 1700-37
论文作者
论文摘要
我们介绍了使用Nustar和Astrosat/Laxpc的高质量X射线二元瞬态源4U 1700-37的光谱和计时研究。在两个不同的通量状态下观察到该来源。 Nustar的FPMA和FPMB的组合光谱分析显示了Cyclotron Line功能的可能提示为$ \ sim $ 16 KEV。该线功能在不同的连续模型中始终存在，至少3 $σ$置信度。我们没有在组合光谱中检测到先前报道的〜39 keV回旋线的存在。 $ \ sim $ 16 kev Cyclotron功能表明，紧凑的对象是具有磁场强度$ \ sim2.1 \ times $ 10 $^{12} $高斯的中子星。我们还发现在Nustar Spectrum 7.6 KEV附近存在罕见的Ni $Kα$排放线。我们搜索了Nustar和Astrosat数据以获取相干或准周期性振荡信号，但在0.1 MHz至10 $^3 $ Hz的频率范围内没有发现证据。
We present a spectral and timing study of the High Mass X-ray Binary transient source 4U 1700-37 using NuSTAR and ASTROSAT/LAXPC. The source is observed in two different flux states. A combined spectral analysis of NuSTAR's FPMA and FPMB shows the possible hint of a cyclotron line feature at $\sim$16 keV. The line feature is consistently present in different continuum models with at least 3$σ$ confidence level. We do not detect the presence of a previously reported ~39 keV cyclotron line in the combined spectra. A $\sim$16 keV cyclotron feature would suggest that the compact object is a neutron star with a magnetic field strength $\sim2.1\times$10$^{12}$ Gauss in the emission region. We also find the presence of a rare Ni $Kα$ emission line around 7.6 keV in the NuSTAR spectrum. We searched the NuSTAR and ASTROSAT data for coherent or quasi-periodic oscillation signals but found no evidence in the frequency range 0.1 mHz to 10$^3$ Hz.
