论文标题
血浆对强镜快速无线电爆发的放大和时间延迟的影响
The effects of plasma on the magnification and time delay of strongly lensed fast radio bursts
论文作者
论文摘要
随着当前和将来的设施，已确定的快速无线电爆发（FRB）的数量正在迅速增加。预计将发现强烈的FRB，这可以提供精确的时间延迟，从而在宇宙学和基本物理学中具有丰富的应用。但是，除重力外，镜头星系中的血浆还会使镜头FRB的无线电信号偏转。重力和等离子体的这种偏转会导致频率依赖的时间延迟，这与分散延迟和由重力透镜引起的几何延迟不同。根据镜头和等离子体模型，镜头图像的频率延迟关系可以显示多个图像之间或与分散关系之间的区分行为。在将来的研究中，尤其是在低射频下，由于晶状体星系中存在等离子体，因此在未来的研究中不能忽略这种现象。更重要的是，此类信息不仅提供了搜索镜头FRB的潜在方法，而且还提供了对镜头银河系中质量和血浆分布的限制。特别是，等离子体可以使缺失的中心图像在低射频下可观察到。
The number of identified Fast Radio Bursts (FRBs) is increasing rapidly with current and future facilities. Strongly lensed FRBs are expected to be found as well, which can provide precise time delays and thus have rich applications in cosmology and fundamental physics. However, the radio signal of lensed FRBs will be deflected by plasma in lens galaxies in addition to gravity. Such deflections by both gravity and plasma will cause frequency dependent time delays, which are different from the dispersion delay and the geometric delay caused by gravitational lensing. Depending on the lensing and plasma models, the frequency-time delay relation of the lensed images can show distinguishing behaviours either between the multiple images, or from the dispersion relation. Such phenomena cannot be neglected in future studies, especially at low radio frequency, as plasma exists in lens galaxies in general. More importantly, such information provides not only a potential way to search for lensed FRBs, but also constraints on the mass and plasma distributions in lens galaxy. In particular, plasma may make the missing central images observable at low radio frequency.
