论文标题
在黑洞X射线二进制中发现振荡超过200 KEV的振荡
Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT
论文作者
论文摘要
低频准周期振荡（LFQPO）通常在黑洞X射线二进制中发现，其起源仍在争论中。 LFQPO在高能（以上KEV以上）处的特性与最内向区域的吸积流的性质密切相关，因此在批判性地测试各种理论模型中起着至关重要的作用。硬X射线调制望远镜（Insight-HXMT）能够检测到30 KEV以上的排放，因此是这样做的理想仪器。在这里，我们报告了在X射线硬状态下新的Black Hole Maxi J1820+070中的LFQPO在200 KEV上方的发现，这使我们能够了解数百千洛克洛特的LFQPOS的行为。 LFQPO的相位滞后在30 keV以下零左右，并变成30 keV以上的软滞后（即，高能光子首先到达）。在150-200 kev频段中，软滞后逐渐随着能量而逐渐增加，并达到约0.9s。在200 KEV高于200的能量，大型软滞后和与LFQPO的能量相关行为的检测对大多数现有模型构成了巨大的挑战，但表明LFQPO可能起源于小型喷气式飞机的进步。
Low-frequency quasi-periodic oscillations (LFQPOs) are commonly found in black hole X-ray binaries, and their origin is still under debate. The properties of LFQPOs at high energies (above 30 keV) are closely related to the nature of the accretion flow in the innermost regions, and thus play a crucial role in critically testing various theoretical models. The Hard X-ray Modulation Telescope (Insight-HXMT) is capable of detecting emissions above 30 keV, and is therefore an ideal instrument to do so. Here we report the discovery of LFQPOs above 200 keV in the new black hole MAXI J1820+070 in the X-ray hard state, which allows us to understand the behaviours of LFQPOs at hundreds of kiloelectronvolts. The phase lag of the LFQPO is constant around zero below 30 keV, and becomes a soft lag (that is, the high-energy photons arrive first) above 30 keV. The soft lag gradually increases with energy and reaches ~0.9s in the 150-200 keV band. The detection at energies above 200 keV, the large soft lag and the energy-related behaviors of the LFQPO pose a great challenge for most currently existing models, but suggest that the LFQPO probably originates from the precession of a small-scale jet.
