论文标题
Scorpius X-1中硬X射线尾巴的洞察力HXMT检测
Insight-HXMT Detections of Hard X-ray Tails in Scorpius X-1
论文作者
论文摘要
使用对2018年Scorpius X-1的硬X射线调制望远镜（Insight-HXMT）的高能检测器的观察，我们在〜30-200 KEV中搜索硬X射线尾巴。硬度强度图的整个Z轨道都发现了硬X射线尾部，它们将其变硬并从水平分支（HB），正常分支（NB）逐渐消失到耀斑的分支（FB）。比较CYG X-1和SCO X-1之间的硬X射线光谱，可以得出结论，Cyg X-1的硬X射线光谱显示出高能量的截止值，这意味着其中有一个热的电晕，但是高能量的截止值在SCO X-1的硬X射线频谱中却没有揭示。 Jointly fitting the HE spectrum with the medium-energy and low-energy spectra of Sco X-1 in ~2-200 keV, it is suggested that the upscattering Comptonization of the neutron star (NS) emission photons by the energetic free-falling electrons onto the NS or by the hybrid electrons in the boundary layer between the NS and the accretion disk could be responsible for the hard X-ray tails of Sco X-1 on HB和NB，但两种机制都不能负责FB上的硬X射线尾部。争论了FB的特殊硬X射线尾部的一些可能起源。
Using the observations of the high-energy (HE) detector of the Hard X-ray Modulation Telescope (Insight-HXMT) for Scorpius X-1 in 2018, we search for hard X-ray tails in the hard X-ray spectra in ~30-200 keV. The hard X-ray tails are found throughout the Z-track on the hardness-intensity diagram and they harden and fade away from the horizontal branch (HB), through the normal branch (NB), to the flaring branch (FB). Comparing the hard X-ray spectra between Cyg X-1 and Sco X-1, it is concluded that the hard X-ray spectrum of Cyg X-1 shows high-energy cutoff, implying a hot corona in it, but the high-energy cutoff does not reveal in the hard X-ray spectrum of Sco X-1. Jointly fitting the HE spectrum with the medium-energy and low-energy spectra of Sco X-1 in ~2-200 keV, it is suggested that the upscattering Comptonization of the neutron star (NS) emission photons by the energetic free-falling electrons onto the NS or by the hybrid electrons in the boundary layer between the NS and the accretion disk could be responsible for the hard X-ray tails of Sco X-1 on the HB and NB, but neither of the two mechanisms can be responsible for the hard X-ray tail on the FB. Some possible origins for the peculiar hard X-ray tail of FB are argued.
