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Spectral Flattening of Crab Giant Pulses at Low Frequencies

Published online by Cambridge University Press:  04 June 2018

Bradley W. Meyers ,
Steven E. Tremblay ,
N. D. Ramesh Bhat  and
Ryan M. Shannon
Bradley W. Meyers
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University 1 Turner Avenue, Technology Park, Bentley, 6102, WA, Australia email: bradley.meyers@postgrad.curtin.edu.au ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO) CSIRO Astronomy and Space Science, Australia Telescope National Facility P.O. Box 76, Epping, NSW 1710, Australia
Steven E. Tremblay
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University 1 Turner Avenue, Technology Park, Bentley, 6102, WA, Australia email: bradley.meyers@postgrad.curtin.edu.au ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)
N. D. Ramesh Bhat
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University 1 Turner Avenue, Technology Park, Bentley, 6102, WA, Australia email: bradley.meyers@postgrad.curtin.edu.au ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO)
Ryan M. Shannon
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University 1 Turner Avenue, Technology Park, Bentley, 6102, WA, Australia email: bradley.meyers@postgrad.curtin.edu.au CSIRO Astronomy and Space Science, Australia Telescope National Facility P.O. Box 76, Epping, NSW 1710, Australia
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Abstract

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The frequency dependence of normal pulsar radio emission is typically observed to be a power law, with some indications of a flattening or turnover at low frequencies (≲ 100 MHz). The spectrum of the Crab pulsar’s giant pulse emission has not been examined as closely. We conducted simultaneous wideband observations of the Crab pulsar, with the Parkes radio telescope and the Murchison Widefield Array, to study the spectral behaviour of its giant pulses. Our analysis shows that the mean spectral index of Crab giant pulses flattens at low frequencies, from −2.6 ± 0.5 between the Parkes bands, to −0.7 ± 1.4 between the lowest MWA subbands.

Keywords

pulsars: generalpulsars: individual (PSR J0534+2200)

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