X-Ray Observations Reveal Magnetic Structure of the Lighthouse Pulsar

• PSR J1101-6101 (Lighthouse pulsar) is a high-energy, rapidly rotating neutron star moving through the Milky Way at 990 km/s.
• The pulsar creates a 37-light-year-long X-ray 'Trail' and an orthogonal 'Filament' as it moves through the Interstellar Medium (ISM).
• New data from NASA’s Imaging X-ray Polarimetry Explorer (IXPE) confirms that high-energy particles in the Filament align with magnetic field lines.

Scientific Findings and Observations

• Research led by Jack Dinsmore (Stanford) analyzed X-ray polarization to map magnetic field structures.
• The Filament shows a high polarization degree (55% ± 18%), suggesting surprisingly low magnetic turbulence and field strength weaker than the local galactic background.
• The Trail exhibits a 26% polarization degree with magnetic field lines running parallel to its axis in X-rays, contrasting with perpendicular radio-wavelength observations.
• These findings support the theory of a layered pulsar wake structure: a parallel magnetic field directs energetic X-ray-emitting particles, while an internal turbulent core hosts cooler, radio-emitting electrons.

Methodology and Technical Challenges

• Observations were conducted over 18 days (950 kiloseconds) in June 2025.
• Researchers overcame technical issues, including the failure of an IXPE detector unit, by developing a custom analytical tool called 'LeakageLib'.