Schwarzschilld-Melvin黑洞时空热点的同步辐射偏振像
Polarized image of synchrotron radiations of hotspots in Schwarzschilld-Melvin black hole spacetime
摘要：
我们重新考察了带电粒子的最内层稳定圆轨道（ISCO），并研究了Schwarzchild-Melvin黑洞时空中赤道面上这类轨道热点发射的同步辐射的偏振像.我们得到一个约束的磁场保留带电粒子的ISCO。特别是，我们确定了一个临界值的磁场强度$B_c$的圆形轨道可以有积极和消极的角动量以上$B_c$，而只有一个分支生存低于$B_c$。此外，我们还研究和讨论了远距离观测者观测到的带有极化方向信息的圆轨道带电热点的一次和二次像。
英文摘要：
We revisit the innermost stable circular orbits (ISCOs) of charged particles and study the polarized images of synchrotron radiations emitted from such orbiting hotspots on the equatorial plane in Schwarzchild-Melvin black hole spacetime. We obtain a constraint on the magnetic field to retain ISCOs for charged particles. In particular, we identify a critical value for the strength of the magnetic field $B_c$ that the circular orbits can have positive and negative angular momentums above $B_c$ while only one branch survive below $B_c$. Furthermore, we investigate and discuss the primary and secondary images of circularly orbiting charged hotspots carrying the information of polarization directions observed by distant observers.
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