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Phase shifts in multi-frequency observations of the drift bands of J0034-0721

Published online by Cambridge University Press:  04 June 2018

Samuel J. McSweeney ,
N. D. Ramesh Bhat ,
Steven E. Tremblay  and
Avinash A. Deshpande
Samuel J. McSweeney
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University 1 Turner Ave., Technology Park, Bentley, WA 6102, Australia 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 Ave., Technology Park, Bentley, WA 6102, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
Steven E. Tremblay
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University 1 Turner Ave., Technology Park, Bentley, WA 6102, Australia ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)
Avinash A. Deshpande
Affiliation:
Raman Research Institute (RRI) C. V. Raman Avenue, Sadashivanagar, Bengaluru 560 080, India
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Abstract

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We observed single pulses from PSR J0034-0721 (B0031-07) simultaneously at the MWA (185 MHz) and the GMRT (610 MHz). Correlation analyses reveal that the phase difference of the average profiles at the two frequencies differs from the phase difference observed between individual subpulses, indicating that the individual emission columns above the pulsar’s rotating carousel of sparks do not evolve in frequency in the same way that the global magnetosphere does. This hints at a possible departure from the dipolar field geometry in this pulsar’s emission region. Moreover, the discrepancy depends on the drift mode, suggestive of a way to constrain the emission heights associated with each drift mode.

Keywords

Pulsars: generalpulsars: individual (J0034-0721)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 376 - 377
Copyright
Copyright © International Astronomical Union 2018 

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