Multi-wavelength emission region of gamma-ray emitting pulsars
arXiv:1106.5297 · doi:10.1088/0004-637X/739/1/14
Abstract
Using the outer gap model, we investigate the emission region for the multi-wavelength light curve from energetic pulsars. We assume that gamma-ray and non-thermal X-ray photons are emitted from a particle acceleration region in the outer magnetosphere, and UV/optical photons originate above that region. We assume that gamma-rays are radiated only by outwardly moving particles, whereas the other photons are produced by particles moving inward and outward. We parameterize the altitude of the emission region as the deviation from the rotating dipole in vacuum and determine it from the observed multi-wavelength pulse profile using the observationally constrained magnetic dipole inclination angle and viewing angle of the pulsars. We find that the outer gap model can explain the multi-wavelength pulse behavior by a simple distribution of emissivity, and discuss the possibility of further improvement. From observational fitting, we also find a general tendency for the altitude of the gamma-ray emission region to depend on the inclination angle. In particular, the emission region for low inclination angle is required to be located in very low altitude, which corresponds to the inner region within the last-open field line of rotating dipole in vacuum. This model suggests a modification of statistics about observed gamma-ray pulsars. Number of the sources with low inclination and viewing angles increases compared with previous estimate.
Accepted for publication in the Astrophysical Journal. 23 pages, 5 figures and 1 table
References in corpus (14)
- Profile and polarization characteristics of energetic pulsars
- Fermi LAT Observations of the Vela Pulsar
- Fitting Pulsar Wind Tori. II. Error Analysis and Applications
- The Galactic Population of Young Gamma-ray Pulsars
- A multiwavelength study on the high-energy behaviour of Fermi/LAT pulsars
- Pulse Profiles, Spectra and Polarization Characteristics of Non-Thermal Emissions from the Crab-Like Pulsars
- Pulsed Gamma-rays from PSR J2021+3651 with the Fermi Large Area Telescope
- Particle Acceleration and Non-Thermal Emission in Pulsar Outer Magnetospheric Gap
- Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE
- Mapping the magnetosphere of PSR B1055-52
- Rings and Jets around PSR J2021+3651: the `Dragonfly Nebula'
- Discovery of Pulsations from the Pulsar J0205+6449 in SNR 3C 58 with the Fermi Gamma-Ray Space Telescope
- Population study for gamma-ray pulsars with the outer gap model
- Non-thermal emissions from outer magnetospheric accelerators of middle-aged pulsars