论文标题
多路复用龙虾眼镜：宽场X射线监视的概念
Multiplexing lobster-eye optics: a concept for wide-field X-ray monitoring
论文作者
论文摘要
我们提出了一个多路复用龙虾眼（m子）光学元件的概念，以实现龙虾眼（LE）宽田X射线监测器中焦平面成像仪数量的显着减少。在m子配置中，将LE镜分为几个片段，并且在这些段中反射的X射线均集中在多路复用配置中的单个图像传感器上。如果每个LE段假设旋转角度不同，则通过LE光学器件从点源重建的横切图像的方位角旋转角度标识将X射线聚焦在成像仪上的特定段。焦距为30 cm，段段为10 x 10 cm^2，天空的〜1 sr可以覆盖36个LE段和四个成像器（总面积为10 x 10 cm^2）。进行了射线跟踪模拟，以评估九个段mule构型。模拟表明，与5- sigma检测极限相关的通量（0.5至2 keV）为〜2 x 10^-10 erg cm^-2 s^-1（10 mcrab），用于瞬态，持续时间为100 s。该模拟还表明，在0.6 keV处的14至17 mcrab范围内通量的瞬态方向以99.7％的置信度极限确定。我们得出的结论是，m子配置可以成为用于未来X射线宽场瞬态监视的小卫星的有效机上装置。
We propose a concept of multiplexing lobster-eye (MuLE) optics to achieve significant reductions in the number of focal plane imagers in lobster-eye (LE) wide-field X-ray monitors. In the MuLE configuration, an LE mirror is divided into several segments and the X-rays reflected on each of these segments are focused on a single image sensor in a multiplexed configuration. If each LE segment assumes a different rotation angle, the azimuthal rotation angle of a cross-like image reconstructed from a point source by the LE optics identifies the specific segment that focuses the X-rays on the imager. With a focal length of 30 cm and LE segments with areas of 10 x 10 cm^2, ~1 sr of the sky can be covered with 36 LE segments and only four imagers (with total areas of 10 x 10 cm^2). A ray tracing simulation was performed to evaluate the nine-segment MuLE configuration. The simulation showed that the flux (0.5 to 2 keV) associated with the 5-sigma detection limit was ~2 x 10^-10 erg cm^-2 s^-1 (10 mCrab) for a transient with a duration of 100 s. The simulation also showed that the direction of the transient for flux in the range of 14 to 17 mCrab at 0.6 keV was determined correctly with 99.7% confidence limit. We conclude that the MuLE configuration can become an effective on-board device for small satellites for future X-ray wide-field transient monitoring.
