On the Dispersion Measure of High-Redshift Synchrotron Sources
  A method is proposed for deriving the dispersion measure (related to the
line-of-sight integrated free electron density) to high-redshift, powerful
synchrotron radio sources by analysis of the temporal/spectral properties of
the recorded signals. This would allow direct measurements of the distributed
density of ionized baryons along the line-of-sights to the sources.
