Unraveling The Emission Geometry Of The Fermi Millisecond Pulsars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The eight millisecond pulsars (MSPs) that have now been detected by Fermi-LAT are providing an excellent opportunity to probe the emission geometry of these ancient compact objects. As they are radio-loud, one may use the relative phase lags across wavebands to obtain constraints on the orientation and size of their radio and gamma-ray beams. We model the MSP light curves using geometric slot gap (SG), outer gap (OG), and polar cap (PC) models, in addition to a pair-starved polar cap (PSPC) model which incorporates the full General Relativistic E-field. We find that the MSPs are either fit by SG / OG or PSPC models, and we deduce values for inclination and observer angles in each case.

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