High speed phase-resolved 2-d UBV photometry of the Crab pulsar

A. Golden, A. Shearer, R. M. Redfern, G. M. Beskin, S. I. Neizvestny, V. V. Neustroev, V. L. Plokhotnichenko, M. Cullum

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We report a phase-resolved photometric and morphological analysis of U BV data of the Crab pulsar obtained with the 2-d TRIFFID high speed optical photometer mounted on the Russian 6m telescope. By being able to accurately iso-late the pulsar from the nebular background at an unprecedented temporal resolution (1 μs), the various light curve components were accurately fluxed via phase-resolved photometry. Within the U BV range, our datasets are consistent with the existing trends reported elsewhere in the literature. In terms of flux and phase duration, both the peak Full Width Half Maxima and Half Width Half Maxima decrease as a function of photon energy. This is similarly the case for the flux associated with the bridge of emission. Power-law fits to the various light curve components are as follows; α = 0.07 ± 0.19 (peak 1), α = -0.06 ± 0.19 (peak 2) and α = -0.44 ± 0.19 (bridge) - the uncertainty here being dominated by the integrated CCD photometry used to independently reference the TRIFFID data. Temporally, the main peaks are coincident to ≤ 10 μs although an accurate phase lag with respect to the radio main peak is compromised by radio timing uncertainties. The plateau on the Crab's main peak was definitively determined to be ≤ 55 μs in extent and may decrease as a function of photon energy. There is no evidence for non-stochastic activity over the light curves or within various phase regions, nor is there evidence of anything akin to the giant pulses noted in the radio. Finally, there is no evidence to support the existence of a reported 60 second modulation suggested to be as a consequence of free precession.

Original languageEnglish (US)
Pages (from-to)617-628
Number of pages12
JournalAstronomy and Astrophysics
Volume363
Issue number2
StatePublished - 2000
Externally publishedYes

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crabs
pulsars
photometry
crab
high speed
radio
light curve
photometer
precession
energy
power law
plateau
photons
temporal resolution
photometers
speed
charge coupled devices
plateaus
time lag
time measurement

Keywords

  • Instrumentation: Photometers - Stars: Neutron
  • Radiation mechanisms: Non-thermal
  • Stars: Pulsars: Individual: PSR B0531+12

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Golden, A., Shearer, A., Redfern, R. M., Beskin, G. M., Neizvestny, S. I., Neustroev, V. V., ... Cullum, M. (2000). High speed phase-resolved 2-d UBV photometry of the Crab pulsar. Astronomy and Astrophysics, 363(2), 617-628.

High speed phase-resolved 2-d UBV photometry of the Crab pulsar. / Golden, A.; Shearer, A.; Redfern, R. M.; Beskin, G. M.; Neizvestny, S. I.; Neustroev, V. V.; Plokhotnichenko, V. L.; Cullum, M.

In: Astronomy and Astrophysics, Vol. 363, No. 2, 2000, p. 617-628.

Research output: Contribution to journalArticle

Golden, A, Shearer, A, Redfern, RM, Beskin, GM, Neizvestny, SI, Neustroev, VV, Plokhotnichenko, VL & Cullum, M 2000, 'High speed phase-resolved 2-d UBV photometry of the Crab pulsar', Astronomy and Astrophysics, vol. 363, no. 2, pp. 617-628.
Golden A, Shearer A, Redfern RM, Beskin GM, Neizvestny SI, Neustroev VV et al. High speed phase-resolved 2-d UBV photometry of the Crab pulsar. Astronomy and Astrophysics. 2000;363(2):617-628.
Golden, A. ; Shearer, A. ; Redfern, R. M. ; Beskin, G. M. ; Neizvestny, S. I. ; Neustroev, V. V. ; Plokhotnichenko, V. L. ; Cullum, M. / High speed phase-resolved 2-d UBV photometry of the Crab pulsar. In: Astronomy and Astrophysics. 2000 ; Vol. 363, No. 2. pp. 617-628.
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N2 - We report a phase-resolved photometric and morphological analysis of U BV data of the Crab pulsar obtained with the 2-d TRIFFID high speed optical photometer mounted on the Russian 6m telescope. By being able to accurately iso-late the pulsar from the nebular background at an unprecedented temporal resolution (1 μs), the various light curve components were accurately fluxed via phase-resolved photometry. Within the U BV range, our datasets are consistent with the existing trends reported elsewhere in the literature. In terms of flux and phase duration, both the peak Full Width Half Maxima and Half Width Half Maxima decrease as a function of photon energy. This is similarly the case for the flux associated with the bridge of emission. Power-law fits to the various light curve components are as follows; α = 0.07 ± 0.19 (peak 1), α = -0.06 ± 0.19 (peak 2) and α = -0.44 ± 0.19 (bridge) - the uncertainty here being dominated by the integrated CCD photometry used to independently reference the TRIFFID data. Temporally, the main peaks are coincident to ≤ 10 μs although an accurate phase lag with respect to the radio main peak is compromised by radio timing uncertainties. The plateau on the Crab's main peak was definitively determined to be ≤ 55 μs in extent and may decrease as a function of photon energy. There is no evidence for non-stochastic activity over the light curves or within various phase regions, nor is there evidence of anything akin to the giant pulses noted in the radio. Finally, there is no evidence to support the existence of a reported 60 second modulation suggested to be as a consequence of free precession.

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