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9th of February 2024
Plots showing the two states of a mode-switching pulsar.
Mode Switching behavior of PSR J0614+2229
by Cai et al.
Cai et al. present a detailed single pulse and polarization study of PSR J0614+2229 based on the archival data using the Ultra-wideband Low-frequency Receiver on the Murriyang, the Parkes radio telescope. The single-pulse sequences show that this pulsar switches between two emission states, in which the emission of state A occurs earlier than that of state B in pulse longitude. The team found that the variation in relative brightness between the two states is related to time and both states follow a simple power law very well. Based on the phase-aligned multi-frequency profiles, they found that there is a significant difference in the distributions of spectral index across the emission regions of the two states. The team infer that at a fixed frequency, the emission height of state A is higher than that of state B and suggest that the mode switching of this pulsar is possibly caused by changes in the emission heights that alter the distributions of spectral index across the emission regions. The image above shows data at a center frequency of 879 MHz. The panel at the left shows the mean pulse profiles for state A (red line) and state B (blue line) as a function of pulse phase and the panel at right shows the sequence of sub-integrations from PSR J0614+2229 clearly showing pulses switching between these two states.

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