An annular gap acceleration model for $\gamma$-ray emission of pulsars

Abstract

If the binding energy of the pulsar's surface is not so high (the case of a neutron star), both the negative and positive charges will flow out freely from the surface of the star. The annular free flow model for $\gamma$-ray emission of pulsars is suggested in this paper. It is emphasized that: (1). Two kinds of acceleration regions (annular and core) need to be taken into account. The annular acceleration region is defined by the magnetic field lines that cross the null charge surface within the light cylinder. (2). If the potential drop in the annular region of a pulsar is high enough (normally the cases of young pulsars), charges in both the annular and the core regions could be accelerated and produce primary gamma-rays. Secondary pairs are generated in both regions and stream outwards to power the broadband radiations. (3). The potential drop in the annular region grows more rapidly than that in the core region. The annular acceleration process is a key point to produce wide emission beams as observed. (4). The advantages of both the polar cap and outer gap models are retained in this model. The geometric properties of the $\gamma$-ray emission from the annular flow is analogous to that presented in a previous work by Qiao et al., which match the observations well. (5). Since charges with different signs leave the pulsar through the annular and the core regions, respectively, the current closure problem can be partially solved.

arXiv comment11 pages 2 figures, accepted by Chinese Journal of Astronomy and Astrophysics

References in corpus (13)

• Time-dependent force-free pulsar magnetospheres: axisymmetric and oblique rotators
• Two-Pole Caustic Model for High-Energy Lightcurves of Pulsars
• Radio Pulsar Death Line Revisited: Is PSR J2144-3933 Anomalous?
• Spark Model for Pulsar Radiation Modulation Patterns
• PSR 0943+10: a bare strange star?
• Large-Amplitude, Pair-Creating Oscillations in Pulsar and Black Hole Magnetospheres
• Regimes of Pulsar Pair Formation and Particle Energetics
• The inner annular Gap for pulsar radiation: gamma-ray and radio emission
• A model for the challenging "bi-drifting" phenomenon in PSR J0815+09
• Reversals of radio emission direction in PSR B1822-09
• On the formation of inner vacuum gaps in radio pulsars
• Pulsar shadow as the origin of double notches in radio pulse profiles
• The Current Flows in Pulsar Magnetospheres

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