Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9912h&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #99.12; Bulletin of the American Astronomical Society, Vol. 24, p.1277
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The Crab pulsar emits occasional radio pulses with peak intensities up to 10(3) larger than the mean pulse. These pulses have been detected at 1.4 and 4.8GHz using the VLA in phased-array mode to synthesize a pencil beam, thereby resolving out the ``background'' radiation from the Crab nebula. The received voltage was sampled before detection at the Nyquist rate appropriate for the full receiver bandwidth and recorded for off-line coherent dedispersion. Significant intensity structure with time scales of ~ 100ns has been found. Many pulses at 1.4GHz show a characteristic sharp rise and exponential decay but with time scales much longer than what would be expected from interstellar scintillation. The 4.8-GHz pulses are much shorter in duration than the 1.4-GHz pulses; the typical durations are less than 20mu s. The implications of the observations upon possible emission mechanisms is discussed.
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