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2011MNRAS.412.1870P - Mon. Not. R. Astron. Soc., 412, 1870-1880 (2011/April-2)
A unified polar cap/striped wind model for pulsed radio and gamma-ray emission in pulsars.
PETRI J.
Abstract (from CDS):
Combining the time-dependent emissivity in the wind, supposed to be inverse Compton radiation, with a simple polar cap emission model along and around the magnetic axis, we compute the radio and gamma-ray light curves, summarizing the results in several phase plots. We study the phase lag as well as the gamma-ray peak separation dependence on the pulsar inclination angle and on the viewing angle. Using the gamma-ray pulsar catalogue, compiled from the Fermi data, we are able to predict the radio lag/peak separation relation and to compare it with available observations taken from this catalogue.
This simple geometric model, combining polar cap and striped wind radiation, is satisfactory for explaining the observed radio/gamma-ray correlation. This supports the idea of distinct emission locations for the radio and gamma-ray radiation. Nevertheless, time retardation effects, such as curved space-time and magnetic field lines winding up close to the neutron star, can lead to a discrepancy between our predicted time lag and a more realistic relation as deduced from the gamma-ray catalogue. Moreover, as there is no accurate polar cap description available so far, large uncertainties remain on the altitude and geometry of the radio emission.
Abstract Copyright: 2011 The Author Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): radiation mechanisms: non-thermal - relativistic processes - pulsars: general - stars: winds, outflows - gamma-rays: stars
Simbad objects: 12
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