Multifrequency Observations of Giant Radio Pulses from the Millisecond Pulsar B1937+21

Details Multifrequency Observations of Giant Radio Pulses from the Millisecond Pulsar B1937+21 Multifrequency Observations of Giant Radio Pulses from the Millisecond Pulsar B1937+21

1999-10-07

arxiv.org/abs/astro-ph/9910134v1

Astronomy and Astrophysics

Astrophysics

21 pages, 10 Postscript figures; LaTeX with aaspp4.sty and epsf.tex; submitted to ApJ

Scientific paper

10.1086/308844

Giant pulses are short, intense outbursts of radio emission with a power-law intensity distribution that have been observed from the Crab Pulsar and PSR B1937+21. We have undertaken a systematic study of giant pulses from PSR B1937+21 using the Arecibo telescope at 430, 1420, and 2380 MHz. At 430 MHz, interstellar scattering broadens giant pulses to durations of $\sim50 \mu$secs, but at higher frequencies the pulses are very short, typically lasting only $\sim1$-$2 \mu$secs. At each frequency, giant pulses are emitted only in narrow ($\lsim10 \mu$s) windows of pulse phase located $\sim 55$-$70 \mu$sec after the main and interpulse peaks. Although some pulse-to-pulse jitter in arrival times is observed, the mean arrival phase appears stable; a timing analysis of the giant pulses yields precision competitive with the best average profile timing studies. We have measured the intensity distribution of the giant pulses, confirming a roughly power-law distribution with approximate index of -1.8, contributing $\gsim0.1%$ to the total flux at each frequency. We also find that the intensity of giant pulses falls off with a slightly steeper power of frequency than the ordinary radio emission.

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