About 10,000 years ago, light from the explosion of a giant star in the constellation Vela arrived at Earth. This supernova left behind a dense object called a pulsar, which appears to brighten regularly as it spins, like a cosmic lighthouse. From the surface of this pulsar, winds of particles emerg
Measuring polarization, which has to do with how electromagnetic waves are organized, gives scientists an unprecedented understanding of how a cosmic object like a pulsar accelerates particles to high speeds.
High polarization means that the electromagnetic fields are well organized; they are lined up in specific directions, and depend on their position in the nebula. What’s more, the X-rays that IXPE detects come from high-energy electrons spiraling in the magnetic fields of the pulsar wind nebula, called “synchrotron emission.” Highly polarized X-rays means that these magnetic fields, too, must be well organized.
IXPE data also suggest that the magnetic field is aligned as a smooth donut-shaped structure around the equator of the pulsar. This shape was in line with scientists’ expectations.
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