论文标题
SGR A*历史耀斑的内在极化对X射线回波（极化）特性的影响
Impact of intrinsic polarisation of Sgr A* historical flares on (polarisation) properties of their X-ray echoes
论文作者
论文摘要
X射线发射在我们银河系的内部$ \ sim $ 100 pc中的分子云上的反射表明，尽管目前非常安静，但我们最近的超级质量黑洞SGR A*应该在最近的过去经历了明亮的X射线发射。由于反射信号的表征有所改善，我们能够推断出最新的耀斑（年龄，持续时间和光度）以及最亮最明亮的个体分子复合物的相对视线处置的参数。我们表明，将这些数据与反射X射线连续体中极化的测量结合在一起，不仅可以证明sgr a*为主要来源，而且还允许得出耀斑发射的内在极化特性。这将有助于确定其背后的辐射机制和潜在的天体物理现象。对于当前最亮的反射分子复合物，SGR A，即将到来的X射线极化器可能已经可以访问所需的灵敏度水平。
Reflection of X-ray emission on molecular clouds in the inner $\sim$ 100 pc of our Galaxy reveals that, despite being extremely quiet at the moment, our supermassive black hole Sgr A* should have experienced bright flares of X-ray emission in the recent past. Thanks to the improving characterisation of the reflection signal, we are able to infer parameters of the most recent flare(s) (age, duration and luminosity) and relative line-of-sight disposition of the brightest individual molecular complexes. We show that combining these data with measurements of polarisation in the reflected X-ray continuum will not only justify Sgr A* as the primary source but also allow deriving intrinsic polarisation properties of the flare emission. This will help to identify radiation mechanisms and underlying astrophysical phenomena behind them. For the currently brightest reflecting molecular complex, Sgr A, the required level of sensitivity might be already accessible with upcoming X-ray polarimeters.
