UNCERTAINTIES OF MODELING GAMMA-RAY PULSAR LIGHT CURVES USING VACUUM DIPOLE MAGNETIC FIELD

Journal Article · Tue Jun 01 04:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/715/2/1270· OSTI ID:21450897

Xuening, Bai; Spitkovsky, Anatoly ^[1]

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1. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

Current models of pulsar gamma-ray emission use the magnetic field of a rotating dipole in vacuum as a first approximation to the shape of a plasma-filled pulsar magnetosphere. In this paper, we revisit the question of gamma-ray light curve formation in pulsars in order to ascertain the robustness of the 'two-pole caustic (TPC)' and 'outer gap (OG)' models based on the vacuum magnetic field. We point out an inconsistency in the literature on the use of the relativistic aberration formula, where in several works the shape of the vacuum field was treated as known in the instantaneous corotating frame, rather than in the laboratory frame. With the corrected formula, we find that the peaks in the light curves predicted from the TPC model using the vacuum field are less sharp. The sharpness of the peaks in the OG model is less affected by this change, but the range of magnetic inclination angles and viewing geometries resulting in double-peaked light curves is reduced. In a realistic magnetosphere, the modification of field structure near the light cylinder (LC) due to plasma effects may change the shape of the polar cap and the location of the emission zones. We study the sensitivity of the light curves to different shapes of the polar cap for static and retarded vacuum dipole fields. In particular, we consider polar caps traced by the last open field lines and compare them to circular polar caps. We find that the TPC model is very sensitive to the shape of the polar cap, and a circular polar cap can lead to four peaks of emission. The OG model is less affected by different polar cap shapes, but is subject to big uncertainties of applying the vacuum field near the LC. We conclude that deviations from the vacuum field can lead to large uncertainties in pulse shapes, and a more realistic force-free field should be applied to the study of pulsar high-energy emission.

• OSTI ID: 21450897
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 715; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
APPROXIMATIONS
CALCULATION METHODS
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
ELECTRONIC CIRCUITS
ENERGY RANGE
FLUID MECHANICS
GAMMA RADIATION
HYDRODYNAMICS
INCLINATION
IONIZING RADIATIONS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MECHANICS
PULSARS
PULSE CIRCUITS
PULSE SHAPERS
RADIATIONS
RELATIVISTIC RANGE
SIGNAL CONDITIONERS
SIMULATION
STARS