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Title: A LOW FREQUENCY SURVEY OF GIANT PULSES FROM THE CRAB PULSAR

Abstract

We present a large survey of giant pulses from the Crab Pulsar as observed with the first station of the Long Wavelength Array. Automated methods for detecting giant pulses at low frequencies where scattering becomes prevalent are also explored. More than 1400 pulses were detected across four frequency bands between 20 and 84 MHz over a seven-month period beginning in 2013, with additional followup observations in late 2014 and early 2015. A handful of these pulses were detected simultaneously across all four frequency bands. We examine pulse characteristics, including pulse broadening and power law indices for amplitude distributions. We find that the flux density increases toward shorter wavelengths, consistent with a spectral turnover at 100 MHz. Our observations uniquely span multiple scattering epochs, manifesting as a notable trend in the number of detections per observation. These results are characteristic of the variable interface between the synchrotron nebula and the surrounding interstellar medium.

Authors:
; ; ; ;  [1]
  1. Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87106 (United States)
Publication Date:
OSTI Identifier:
22667406
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 829; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; CRAB NEBULA; DETECTION; DISTRIBUTION; FLUX DENSITY; INTERFACES; MHZ RANGE; MULTIPLE SCATTERING; NEBULAE; PULSARS; PULSES; SYNCHROTRON RADIATION; WAVELENGTHS

Citation Formats

Eftekhari, T., Stovall, K., Dowell, J., Schinzel, F. K., and Taylor, G. B. A LOW FREQUENCY SURVEY OF GIANT PULSES FROM THE CRAB PULSAR. United States: N. p., 2016. Web. doi:10.3847/0004-637X/829/2/62.
Eftekhari, T., Stovall, K., Dowell, J., Schinzel, F. K., & Taylor, G. B. A LOW FREQUENCY SURVEY OF GIANT PULSES FROM THE CRAB PULSAR. United States. doi:10.3847/0004-637X/829/2/62.
Eftekhari, T., Stovall, K., Dowell, J., Schinzel, F. K., and Taylor, G. B. Sat . "A LOW FREQUENCY SURVEY OF GIANT PULSES FROM THE CRAB PULSAR". United States. doi:10.3847/0004-637X/829/2/62.
@article{osti_22667406,
title = {A LOW FREQUENCY SURVEY OF GIANT PULSES FROM THE CRAB PULSAR},
author = {Eftekhari, T. and Stovall, K. and Dowell, J. and Schinzel, F. K. and Taylor, G. B.},
abstractNote = {We present a large survey of giant pulses from the Crab Pulsar as observed with the first station of the Long Wavelength Array. Automated methods for detecting giant pulses at low frequencies where scattering becomes prevalent are also explored. More than 1400 pulses were detected across four frequency bands between 20 and 84 MHz over a seven-month period beginning in 2013, with additional followup observations in late 2014 and early 2015. A handful of these pulses were detected simultaneously across all four frequency bands. We examine pulse characteristics, including pulse broadening and power law indices for amplitude distributions. We find that the flux density increases toward shorter wavelengths, consistent with a spectral turnover at 100 MHz. Our observations uniquely span multiple scattering epochs, manifesting as a notable trend in the number of detections per observation. These results are characteristic of the variable interface between the synchrotron nebula and the surrounding interstellar medium.},
doi = {10.3847/0004-637X/829/2/62},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 829,
place = {United States},
year = {2016},
month = {10}
}