Repeating fast radio bursts (FRBs) are mysterious radio transient sources in the universe that emit a repeating radio pulse lasting for a few milliseconds. Plasma lensing is the cold, non-magnetized, and inhomogeneous plasma cloud in cosmic space, which can refract the radio signal as images with frequency-dependent properties, such as the frequency-dependent dispersion measure (DM).
The waiting time, the interval between two adjacent bursts within an observational campaign, is also an important parameter for a repeating FRB. Thus, theon the multi-frequency DMs and waiting times of a repeating FRB can unveil the lensing effects in the propagation path.
Recently, Wang Yubin, a Ph.D. candidate at the Xinjiang Astronomical Observatory of the Chinese Academy of Sciences, under the guidance of his supervisor Dr. Zhou Xia, and his collaborators, sorted out the multi-frequency observation data of repeating FRBs, and studied the statistical characteristics of DM and the waiting time of FRB180916.J0158+65 .
In addition, they compared the delay time due to lensing effects with the waiting time in the left distribution and the delay time induced by frequency-dependent DM. Results indicated that FRB 180916 might be suffering from the plasma effects in the propagation path. The high mass X-ray binary scenario was more suitable for its origin after discussing many possible models to produce bursts.Yu-Bin Wang et al, Statistical properties and lensing effect on the repeating fast radio burst FRB 180916.J0158+65,
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