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8th of December 2020
Parkes monitoring of the globular cluster pulsar J1803-3002A
by Zhang et al.
Zhang et al. have reported the first wideband monitoring observations of PSR J1803−3002A, a relatively bright millisecond pulsar in the globular cluster NGC 6522 with a spin period of 7.1 ms. The observations were performed using the Parkes 64-m radio telescope with the Ultra-Wideband Low (UWL) receiver system, which covers 704 to 4032 MHz. Zhang et al. confirm that PSR J1803−3002A is an isolated millisecond pulsar located near the cluster center and probe the emission properties of the pulsar over the wide observed band. The mean pulse profile consists of three components. Unusually, the fractional linear and circular polarization increase with increasing frequency. PSR J1803−3002A is a distant pulsar in the Galactic plane, but the observations show no evidence of pulse broadening due to interstellar scattering. The image above shows the timing residuals for PSR J1803−3002A based on the Parkes UWL monitoring observations over the 704 to 4032 MHz UWL band. The dashed line marks the zero-line and corresponds to the arrival times predicted by the timing solution. The different colours for the residuals represent the three RF bands: Band 1 (704–1344 MHz; purple), Band 2 (1344–2368 MHz; green) and Band 3 (2368–4032 MHz; blue). These results demonstrate the power of ultra-wideband receivers and signal processing systems.

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