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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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