Parkes observations for project P1325 semester 2025APRS_06

We request 15 hours of observing time with the Parkes UWL receiver (700-4000 MHz) to investigate frequency-dependent eclipsing in three spider millisecond pulsars (MSPs): one redback and two black widows. Spider MSPs commonly exhibit frequency-dependent eclipsing, which provides insights into their dense, magnetized plasma environments. We propose to use the Parkes telescope with the UWL receiver in full polar mode to investigate key properties of three spider MSPs, focusing on their eclipse mechanisms and polarization characteristics. Our goals include modeling the eclipse phase spectra using wideband observations to examine the transition from optically thick to thin regimes and exploring the underlying eclipse mechanisms. Additionally, we aim to study the polarization properties of these MSPs, which remain unexplored around 2 GHz, and also to investigate high-frequency eclipses similar to those observed in systems like J1908+2105. Such eclipses suggest the presence of dense and magnetized plasma environments, enabling more precise constraints on parameters like electron column density and magnetic field strengths. Furthermore, we plan to probe magnetic fields by observing potential changes in rotation measure (RM) at eclipse ingress and egress.