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Measuring pulse times of arrival from broad-band pulsar observations

Liu, K ; Desvignes, G ; Cognard, I ; Stappers, B. W ; Verbiest, J. P. W ; Lee, K. J ; Champion, D. J ; Kramer, M ; Freire, P. C. C ; Karuppusamy, R

Monthly notices of the Royal Astronomical Society, 2014-10, Vol.443 (4), p.3752-3760 [Periódico revisado por pares]

London: Oxford University Press

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  • Título:
    Measuring pulse times of arrival from broad-band pulsar observations
  • Autor: Liu, K ; Desvignes, G ; Cognard, I ; Stappers, B. W ; Verbiest, J. P. W ; Lee, K. J ; Champion, D. J ; Kramer, M ; Freire, P. C. C ; Karuppusamy, R
  • Assuntos: Astronomy ; Astrophysics ; Dispersion ; Experiments ; Fourier analysis ; Pulsars ; Sciences of the Universe ; Space telescopes
  • É parte de: Monthly notices of the Royal Astronomical Society, 2014-10, Vol.443 (4), p.3752-3760
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: In recent years, instrumentation enabling pulsar observations with unprecedentedly high fractional bandwidth has been under development which can be used to substantially improve the precision of pulsar timing experiments. The traditional template-matching method used to calculate pulse times of arrival (ToAs) may not function effectively on these broad-band data due to a variety of effects such as diffractive scintillation in the interstellar medium, profile variation as a function of frequency, dispersion measure (DM) evolution, and so forth. In this paper, we describe the channelized discrete Fourier transform method that can greatly mitigate the influence of the aforementioned effects when measuring ToAs from broad-band timing data. The method is tested on simulated data, and its potential in improving timing precision is shown. We further apply the method to PSR J1909−3744 data collected at the Nançay Radio Telescope with the Nançay Ultimate Pulsar Processing Instrument. We demonstrate removal of systematics due to the scintillation effect as well as improvement on ToA measurement uncertainties. Our method also determines temporal variations in DM, which are consistent with multichannel timing approaches used earlier.
  • Editor: London: Oxford University Press
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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