Pulsar Fluctuation Spectra and the Generalized Drifting-Subpulse Phenomenon

Backer, D. C.; Rankin, John; Campbell, D. B.

doi:10.1086/152134

Cited by 126 publications

(137 citation statements)

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“…Sparks feed relativistic positron beams into localized bundles of open field I ines. These sparks are shown to drift around the polar gap with a period P 3 whose magnitude and dependence on the neutron star rotation period agree well with that observi d for drifting subpuh 'S (Backer 1973). The expected spacing between sparks in the gap corresponds to and· fits the observed subperiod P 2 • Growth, persistence, and decay of sparks last a few microseconds.…”

Section: Introductionsupporting

confidence: 77%

Theory of pulsars: polar gaps, sparks, and coherent microwave radiation

Ruderman¹,

Sutherland²

1974

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Section: Introductionsupporting

confidence: 77%

Theory of pulsars: polar gaps, sparks, and coherent microwave radiation

Ruderman¹,

Sutherland²

1974

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“…The derived power values are overestimated by, on average, 2σ 2 l , leading to significant bias in parts of the envelope with low (or zero) signal-to-noise ratio. This bias is intrinsic to the amplitude-phase representation of noisy data, and so is also familiar from the estimation of the longitude-dependent envelope from LRF spectra (Backer 1973) and of modulation indices (e.g. Taylor & Huguenin 1971).…”

Section: Extraction Of the Modulation Envelopesmentioning

confidence: 99%

Drifting sub-pulse analysis using the two-dimensional Fourier transform

Edwards

Stappers

2002

A&A

103

116

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Abstract. The basic form of drifting sub-pulses is that of a periodicity whose phase depends (approximately linearly) on both pulse longitude and pulse number. As such, we argue that the two-dimensional Fourier transform of the longitude-time data (called the Two-Dimensional Fluctuation Spectrum; 2DFS) presents an ideal basis for studies of this phenomenon. We examine the 2DFS of a pulsar signal synthesized using the parameters of an empirical model for sub-pulse behaviour. We show that the transform concentrates the modulation power to a relatively small area of phase space in the region corresponding to the characteristic frequency of sub-pulses in longitude and pulse number. This property enables the detection of the presence and parameters of drifting sub-pulses with great sensitivity even in data where the noise level far exceeds the instantaneous flux density of individual pulses. The amplitude of drifting sub-pulses is modulated in time by scintillation and pulse nulling and in longitude by the rotating viewing geometry (with an envelope similar to that of the mean pulse profile). In addition, subpulse phase as a function of longitude and pulse number can differ from that of a sinusoid due to variations in the drift rate (often associated with nulling) and through the varying rate of traverse of magnetic azimuth afforded by the sight line. These deviations from uniform sub-pulse drift manifest in the 2DFS as broadening of the otherwise delta-function response of a uniform sinusoid. We show how these phase and amplitude variations can be extracted from the complex spectrum.

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“…The subpulse "drift-bands" clearly visible in the observed drift pattern Send offprint requests to: J. A. Gil, e-mail: jag@astro.ca.wsp.zgora.pl (Backer 1973) are separated vertically byP 3 (in pulsar periods) and horizontally by P 2 (in pulse longitude). The latter is estimated as being about 11 • and can be converted into the magnetic azimuth angle η separating adjacent subbeams.…”

Section: Introductionmentioning

confidence: 98%

Vacuum gap model for PSR B0943+10

Gil

Melikidze

Mitra

2002

A&A

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Abstract. PSR B0943+10 is known to show remarkably stable drifting subpulses, which can be interpreted in terms of a circumferential motion of 20 sparks, each completing one circulation around the periphery of the polar cap in 37 pulsar periods. We use this observational constraint and argue that the vacuum gap model can adequately describe the observed drift patterns. Further we demonstrate that only the presence of strong non-dipolar surface magnetic field can favor such vacuum gap formation. Subsequently, for the first time we are able to constrain the parameters of the surface magnetic field, and model the expected magnetic structure on the polar cap of PSR B0943+10 considering the inverse Compton scattering photon dominated vacuum gap.

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Pulsar Fluctuation Spectra and the Generalized Drifting-Subpulse Phenomenon

Cited by 126 publications

References 0 publications

Theory of pulsars: polar gaps, sparks, and coherent microwave radiation

Theory of pulsars: polar gaps, sparks, and coherent microwave radiation

Drifting sub-pulse analysis using the two-dimensional Fourier transform

Vacuum gap model for PSR B0943+10

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