AI Insight
Joint observations from China's Einstein Probe satellite and the Large High Altitude Air Shower Observatory (LHAASO) have revealed a 42-light-year-long X-ray tail emanating from a pulsar located approximately 4,600 light-years from Earth. This exceptionally long tail, never before observed in its entirety, aligns spatially with ultrahigh-energy gamma-ray emissions detected by LHAASO in the same region. The discovery provides new evidence linking the pulsar to previously unattributed gamma-ray sources and offers insights into cosmic ray acceleration and propagation mechanisms.
Why it matters
This finding helps address fundamental questions about the origin and acceleration of high-energy cosmic rays, a mystery that has persisted for over a century in astrophysics. The spatial correlation between the X-ray tail and gamma-ray emissions may resolve the classification of certain "orphan" gamma-ray sources and advance our understanding of how pulsars contribute to the cosmic ray population.
Understand the Science
Understanding the origin, acceleration and propagation of high-energy cosmic rays has been a century-old mystery in astrophysics. Recently, joint observations from China’s Einstein Probe (EP) satellite and the Large High Altitude Air Shower Observatory (LHAASO) showed an extraordinarily long X-ray tail near a pulsar about 4,600 light-years (27 quadrillion miles) from Earth—one that had never before been seen in full. The tail extends about 42 light-years (250 trillion miles) and stretches in the same direction as ultrahigh-energy gamma-ray emission detected by LHAASO, with the two showing a close spatial match.
Source: A 42-light-year X-ray tail links a pulsar to previously 'orphan' gamma rays