An Inverse Compton Scattering Model of Pulsar Emission. III. Polarization

Xu, R. X.; Liu, J. F.; Han, J. L.; Qiao, G. J.

doi:10.1086/308824

Cited by 43 publications

(38 citation statements)

References 30 publications

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“…The actual energy and density distributions of particles in the magnetosphere are not clear at present. There exist other emission mechanisms, like ICS (Xu et al 2000), plasma process (Beskin et al 1988). Moreover, we treated the coherency in a simple way by assuming the coherent bunch to be a huge point charge.…”

Section: Discussionmentioning

confidence: 99%

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Curvature radiation in rotating pulsar magnetosphere

Wang

Han

2012

Proc. IAU

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We consider the curvature emission properties from relativistic particles streaming along magnetic field lines and co-rotating with pulsar magnetosphere. The co-rotation affects the trajectories of the particles and hence the emission properties, especially the polarization. We consider the modification of the particle velocity and acceleration due to the co-rotation. Curvature radiation from a single particle is calculated using the approximation of a circular path to the particle trajectory. Curvature radiation from particles at a given height actually contains the contributions from particles streaming along all the nearby field lines around the tangential point, forming the emission cone of 1/γ. The polarization patterns from the emission cone are distorted by the additional rotation, more serious for emission from a larger height. Net circular polarization can be generated by the density gradient in the emission cone. For three typical density models in the form of core, cone and patches, we calculate the polarization profiles for emission generated at a given height. We find that the circular polarization could have a single sign or sign reversal, depending on the density gradient along the rotation phase. The polarization profiles of the total curvature radiation from the whole open field line region, calculated by adding the emission from all possible heights, are similar to that from a dominating emission height. The circular polarization of curvature radiation has sign reversals in the patchy emission, while it has a single sign for the core emission, and is negligible for the cone emission.

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Section: Discussionmentioning

confidence: 99%

“…Various radio emission mechanisms are suggested to explain polarization profiles (e.g. Beskin et al 1988;Xu et al 2000;Gangadhara 2010). …”

Section: Introductionmentioning

confidence: 99%

Curvature radiation in rotating pulsar magnetosphere

Wang

Han

2012

Proc. IAU

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“…The ICS model (Qiao & Lin 1998;Xu et al 2000;Qiao et al 2001Qiao et al , 2004 suggests that the observed radio emission comes from different emission heights and each sparking ring can, in principle, lead to several emission cone-shaped beams. Following Qiao & Lin (1998), one can get the so-called beamfrequency figure of the ICS model, which naturally gives rise to a narrow central core emission component and two conal components, meeting the empirical proposal of Rankin (1983Rankin ( , 1993) from radio pulsar data.…”

Section: The Inverse Compton Scattering Model Of Pulsar Radio Emissionmentioning

confidence: 99%

“…In this Letter, we propose that the bi-drifting phenomenon is a natural consequence of the coexistence of the IAG and the ICG. Furthermore, the complicated drifting patterns in PSR J0815ϩ09 could be reproduced if the pulsar radio emission is dominantly generated through coherent inverse Compton scattering (ICS) processes (Qiao & Lin 1998;Xu et al 2000;Qiao et al 2001).…”

Section: Introductionmentioning

confidence: 99%

A Model for the Challenging "Bi-drifting" Phenomenon in PSR J0815+09

Qiao

Lee

Zhang

et al. 2004

ApJ

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A new drifting pulsar, PSR J0815ϩ09, was discovered in the Arecibo drift-scan searches. An intriguing feature of this source is that within the four pulse components in the integrated pulse profile, the subpulse drifting direction in the two leading components is opposite from that in the two trailing components. In the view that the leading theoretical model for pulsar subpulse drifting can only interpret one-direction subpulse drifting, the observed bi-drifting phenomenon from PSR J0815ϩ09 poses a great challenge to the pulsar theory. The inner annular gap (IAG), a new type of inner particle accelerator, was recently proposed to explain both g-ray and radio emission from pulsars. Here we show that the coexistence of the IAG and the conventional inner core gap offers a natural interpretation to the bi-drifting phenomenon. In particular, the peculiar drifting behavior in PSR J0815ϩ09 can be reproduced within the inverse Compton scattering model for pulsar radio emission.

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“…Theoretically, we can know the emission heights of beam components at a certain observation frequency in the inverse Compton scattering model [10,17] , based on which the three components (core, inner cone, and outer cone) can be understood naturally. The frequency ν of radio wave emitted at position r (or height r − R, R is the pulsar radius) can be gotten by following Eq.(5-7).…”

Section: The Relationship Between Observed Frequency and Shifted Phasementioning

confidence: 99%

A Further Study of Relative Longitude Shift of Pulsar Beams

Qiao

2001

Chin. J. Astron. Astrophys.

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It is of great important to study pulsar beam shapes if we are concerned with emission theories and pulsar birth rate. Both observations [9,16] and/or the ICS model [10] show that different emission components are emitted from different heights. The relative longitude phase shifts due to different heights of emission components and to the toroidal velocity of electron are considered in this paper. Several possible observational features arising from the phase shift effects are presented. The emission beams may not have circular cross sections although the emission regions may be symmetric with respect to the magnetic axes.

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An Inverse Compton Scattering Model of Pulsar Emission. III. Polarization

Cited by 43 publications

References 30 publications

Curvature radiation in rotating pulsar magnetosphere

Curvature radiation in rotating pulsar magnetosphere

A Model for the Challenging "Bi-drifting" Phenomenon in PSR J0815+09

A Further Study of Relative Longitude Shift of Pulsar Beams

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