Radio emission from a pulsar's magnetic pole revealed by general relativity

Area of Science:

• Astronomy and Astrophysics
• General Relativity
• Pulsar Physics

Background:

• Binary pulsars are influenced by general relativity (GR), leading to the precession of their spin axes.
• Understanding pulsar emission mechanisms and relativistic effects is crucial for testing fundamental physics.

Purpose of the Study:

• To validate the geometrical model of pulsar polarization using polarimetric radio observations.
• To reconstruct the polarization emission map of PSR J1906+0746 and predict its emission disappearance.
• To perform tests of general relativity using the spin precession of binary pulsars.

Main Methods:

• Utilizing polarimetric radio observations of the binary pulsar PSR J1906+0746.
• Reconstructing the sky-projected polarization emission map over the pulsar's magnetic pole.
• Applying relativistic treatments to pulsar polarization models and measuring the pulsar beaming fraction.

Main Results:

• Demonstrated the validity of the geometrical model of pulsar polarization.
• Predicted the detectable emission of PSR J1906+0746 to disappear by 2028.
• Constrained relativistic pulsar polarization models and measured the pulsar beaming fraction.

Conclusions:

• The study validates GR predictions for binary pulsars and pulsar polarization models.
• Findings have implications for understanding neutron star populations and merger rates.
• The observed spin precession provides a new testbed for general relativity in strong gravitational fields.