论文标题
黑洞瞬态源的柔软状态Maxi J1820+070：从凹痕区域的边缘发射？
The Soft State of the Black Hole Transient Source MAXI J1820+070: Emission from the Edge of the Plunge Region?
论文作者
论文摘要
银河黑洞X射线二进制二进制Maxi J1820+070在2018年成为天空中第二明亮的X射线源时发生了明亮的爆发。对于XMM-Newton和Chandra等X射线CCD仪器来说，它太亮了，但是通过光子计数仪器（例如Notole and Nustar）很好地观察了它。我们在这里报告在软状态下发现过量的排放组件。除常规磁盘发射外，它最好以黑体频谱进行建模，该磁盘发射以磁盘或kerrbb为模型。它的温度从约0.9到1.1 KEV不等，比磁盘的内盘温度高约30％至80％。它的通量在圆盘通量的4％至12％之间变化。对磁化磁盘的模拟预测，在最内向稳定的圆形轨道（ISCO）上，围绕黑洞的非零扭矩与非零扭矩相关的过量发射可能性，从其他NUSTAR研究中，这是大约5个重力半径或约60 km（对于黑洞质量为8 m）。在这种情况下，ISCO的发射区的宽度在1.3至4.6公里之间变化，并且将涵盖物质开始自由地落入黑洞的突击区域的开始。
The Galactic black hole X-ray binary MAXI J1820+070 had a bright outburst in 2018 when it became the second brightest X-ray source in the Sky. It was too bright for X-ray CCD instruments such as XMM-Newton and Chandra, but was well observed by photon-counting instruments such as NICER and NuSTAR. We report here on the discovery of an excess emission component during the soft state. It is best modelled with a blackbody spectrum in addition to the regular disk emission, modelled either as diskbb or kerrbb. Its temperature varies from about 0.9 to 1.1 keV which is about 30 to 80 per cent higher than the inner disc temperature of diskbb. Its flux varies between 4 and 12 percent of the disc flux. Simulations of magnetised accretion discs have predicted the possibility of excess emission associated with a non-zero torque at the Innermost Stable Circular Orbit (ISCO) about the black hole, which from other NuSTAR studies lies at about 5 gravitational radii or about 60 km (for a black hole mass is 8 M). In this case the emitting region at the ISCO has a width varying between 1.3 and 4.6 km and would encompass the start of the plunge region where matter begins to fall freely into the black hole.
