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Oswald et al. have undertaken a study of the broadband
polarization of 271 young radio pulsars, focusing particularly on
circular polarization, using high quality observations made with the
Ultra-Wideband Low receiver on Murriyang, the Parkes 64m radio
telescope. As an understanding of pulsar radio polarization requires
both a detailed study of individual sources and a collective
understanding of population-level trends, Oswald et al. provide
visualizations of phase- and frequency-resolved polarization
parameters of individual sources, and highlight the importance of
including the impact of circular polarization and spin-down energy in
overall trends.
The figure above shows pulse profiles at eight frequencies from 812–3780 MHz, with total
intensity (black), linear polarization (red dashes), and circular
polarization (blue dots). Frequency evolution of both the
polarization fraction and profile shape of its linear polarization is
evident, with the linear polarization fraction decreasing
significantly at high frequencies.
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