Echoes of Giant Pulses from the Crab Pulsar

Details Echoes of Giant Pulses from the Crab Pulsar Echoes of Giant Pulses from the Crab Pulsar

2006-12-04

arxiv.org/abs/astro-ph/0612109v1

Astronomy and Astrophysics

Astrophysics

to appear in proceedings of "Small Ionized and Neutral Structures in the Diffuse Interstellar Medium". 4 pages, 1 figure

Scientific paper

We have detected occasional, short-lived ``echoes'' of giant pulses from the Crab pulsar. These echo events remind us of previously reported echoes from this pulsar, but they differ significantly in detail. Our echo events last at most only a few days; the echo emission lags the primary emission by only 40-100 musec. The echoes are consistently weaker and broader than the primary emission, and appear only at the lower of our two simultaneous observing frequencies. We suggest that these echoes are created by refraction in small plasma structures -- plasma clouds or magnetic flux ropes -- deep within the Crab nebula. If this is true, our echoes provide a new probe of small-scale structures within the inner synchrotron nebula.

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