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23rd of January 2015 |
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2014 Science Highlights |
The three discrete nulling time-scales of PSR J1717-4054 |
Kerr et al. (2014) studied the emission
from PSR J1717-4054 over intervals from single pulses to years using the
Parkes radio telescope and the Australia Telescope Compact Array (ATCA).
They identified and characterized nulling at three discrete time-scales:
the pulsar emits during `active states' separated by nulls lasting many
thousands of rotations, while active states themselves are interrupted by
nulls with a bimodal distribution of durations - one to two rotations, or
tens of rotations. - The image shows a typical "waterfall" plot with the
pulsar in its ON & OFF states over the two days of observations. Both the
long nulls and short nulls are clearly visible, as well as the extreme
randomness in distribution of OFF times. |