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• W3098404015 endingPage "822" @default.
• W3098404015 startingPage "800" @default.
• W3098404015 abstract "An interesting new high-energy pulsar sub-population is emerging following early discoveries of gamma-ray millisecond pulsars (MSPs) by the Fermi Large Area Telescope (LAT). We present results from 3D emission modeling, including the Special Relativistic effects of aberration and time-of-flight delays and also rotational sweepback of B-field lines, in the geometric context of polar cap (PC), outer gap (OG), and two-pole caustic (TPC) pulsar models. In contrast to the general belief that these very old, rapidly-rotating neutron stars (NSs) should have largely pair-starved magnetospheres due to the absence of significant pair production, we find that most of the light curves are best fit by TPC and OG models, which indicates the presence of narrow accelerating gaps limited by robust pair production -- even in these pulsars with very low spin-down luminosities. The gamma-ray pulse shapes and relative phase lags with respect to the radio pulses point to high-altitude emission being dominant for all geometries. We also find exclusive differentiation of the current gamma-ray MSP population into two MSP sub-classes: light curve shapes and lags across wavebands impose either pair-starved PC (PSPC) or TPC / OG-type geometries. In the first case, the radio pulse has a small lag with respect to the single gamma-ray pulse, while the (first) gamma-ray peak usually trails the radio by a large phase offset in the latter case. Finally, we find that the flux correction factor as a function of magnetic inclination and observer angles is typically of order unity for all models. Our calculation of light curves and flux correction factor for the case of MSPs is therefore complementary to the ATLAS paper of Watters et al. for younger pulsars." @default.
• W3098404015 created "2020-11-23" @default.
• W3098404015 creator A5034888164 @default.
• W3098404015 creator A5072508597 @default.
• W3098404015 creator A5091186797 @default.
• W3098404015 date "2009-11-25" @default.
• W3098404015 modified "2023-10-09" @default.
• W3098404015 title "PROBING MILLISECOND PULSAR EMISSION GEOMETRY USING LIGHT CURVES FROM THE<i>FERMI</i>/LARGE AREA TELESCOPE" @default.
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