Distinguishing the observational signatures of hot spots orbiting Reissner-Nordström spacetime  

作　　者：吴天枢 陈一千 Tianshu Wu;Yiqian Chen(Center for Theoretical Physics,College of Physics,Sichuan University,Chengdu 610064,China)

机构地区：[1]Center for Theoretical Physics,College of Physics,Sichuan University,Chengdu 610064,China

出　　处：《Chinese Physics C》2024年第7期221-230,共10页中国物理C（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China(12105191,11947225,11875196)。

摘　　要：This paper investigates observable signatures of hot spots orbiting Reissner-Nordström(RN)black holes and naked singularities.For an RN black hole,we find two discernible lensing image tracks in time integrated images,capturing a complete orbit of hot spots and a image shadow within the critical curve where photons with a small impact parameter fall into the event horizon.Conversely,in RN singularities,additional image tracks can be found within the critical curve,originating from photons reflected by the infinitely high effective potential well.Moreover,we find incomplete and converging tracks from the time integrated images of hot spot orbiting RN singularities that have no photon sphere.The presence of these additional image tracks significantly influences temporal magnitudes at their local maxima,enabling us to differentiate between RN black holes and RN naked singularities.

关 键 词：ASTROMETRY gravitational lensing black hole physics D0I:10.1088/1674-1137/ad3c2d 

分 类 号：P145.8[天文地球—天体物理]