OBSERVATIONS OF CRAB GIANT PULSES IN 20-84 MHz USING LWA1

Journal Article · Fri May 10 04:00:00 EDT 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/768/2/136· OSTI ID:22126749

Ellingson, S. W.; Wolfe, C. N. ^[1]; Clarke, T. E.; Hicks, B. C.; Wilson, T. L. ^[2]; Craig, J.; Taylor, G. B. ^[3]; Lazio, T. J. W. ^[4]

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1. Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24060 (United States)
2. US Naval Research Laboratory, Code 7213, Washington, DC 20375 (United States)
3. Department of Physics and Astronomy, University of New Mexico, Albuquerque NM 87131 (United States)
4. Jet Propulsion Laboratory, California Institute of Technology, MS 138-308, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States)

We report the detection and observed characteristics of giant pulses from the Crab Nebula pulsar (B0531+21) in four frequency bands covering 20-84 MHz using the recently completed Long Wavelength Array Station 1 (LWA1) radio telescope. In 10 hr of observations distributed over a 72 day period in fall of 2012, 33 giant pulses having peak flux densities between 400 Jy and 2000 Jy were detected. Twenty-two of these pulses were detected simultaneously in channels of 16 MHz bandwidth centered at 44 MHz, 60 MHz, and 76 MHz, including one pulse which was also detected in a channel centered at 28 MHz. We quantify statistics of pulse amplitude and pulse shape characteristics, including pulse broadening. Amplitude statistics are consistent with expectations based on extrapolations from previous work at higher and lower frequencies. Pulse broadening is found to be relatively high, but not significantly greater than expected. We present procedures that have been found to be effective for observing giant pulses in this frequency range.

• OSTI ID: 22126749
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 768; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
79 ASTRONOMY AND ASTROPHYSICS
AMPLITUDES
COSMIC RAY DETECTION
CRAB NEBULA
DETECTION
EXTRAPOLATION
FLUX DENSITY
MHZ RANGE
PEAKS
PULSARS
PULSE SHAPERS
PULSES
RADIO TELESCOPES
SCATTERING
STATISTICS
WAVELENGTHS