Extended Data Fig. 5: Emission height constraint of FRB 20221022A.
From: A pulsar-like polarization angle swing from a nearby fast radio burst
Emission height measurements determined via the aberration/retardation effect35 versus rotation period for a sample of pulsars observed with FAST74 (blue circles). The twin y-axis indicates the corresponding time delay (Δt) for a given emission height determined from the relation, \({h}_{{em}}^{{delay}}\approx c\Delta t/4\). An upper-limit on the emission height for FRB 20221022A is indicated by the horizontal dashed-dotted line at a lag of Δt ≲ 0.5 ms which corresponds to an emission height of \({h}_{{em}}^{{delay}}\lesssim 40\,{\rm{km}}\), a provisional constraint that assumes an approximately symmetric beam. The grey hatched region for periods ≲ 5 ms corresponds to periods that are ruled-out by RVM-fitting.
