A new study sheds light on the origins of a unique 'zebra' pattern found in high-frequency radio pulses emitted from the Crab Pulsar, a neutron star in the Crab Nebula.
Spotting unusual signals from outer space has been a staple of science fiction because of its potential to lead to amazing discoveries if not outright extraterrestrial contacts. New findings by a theoretical astrophysicist from the University of Kansas make a fascinating contribution to this genre. They appear to solve a mystery of nearly two decades about the origins of a strange “zebra” pattern found in high-frequency radio pulses emitted from the Crab Nebula.
This nebula, 6,500 light years away from Earth, is a remnant of a supernova in the constellation Taurus – a giant star explosion observed from Earth in 1054 AD, as historical records indicate. At its center, the Crab Nebula includes a neutron star that’d become a pulsar – a so-called “Crab Pulsar” 12 miles in width, known for sending beams of electromagnetic radiation far into space. The study titled “Origin of Spectral Bands in the Crab Pulsar Radio Emission” takes a deep dive into the mysterious “zebra” pattern first detected in 2007. This pattern is characterized by unevenly spaced bands in the electromagnetic spectrum, proportional to their frequencies, along with high polarization and unexpected stability. According to the study’s lead author and UK physics professor Mikhail Medvedev, the pulsed “zebra” emission resembles a lighthouse beam passing by Earth as the pulsar rotates, typically producing one or two pulses per rotation. The “zebra” pattern is unique to a single emission from the Crab Pulsar, distinct from the main broadband pulse commonly observed in other pulsars. This high-frequency interpulse ranges from 5 to 30 gigahertz—frequencies similar to those in a microwave oven. The pattern’s brightness and singular occurrence make it a focal point for astrophysical study
Crab Pulsar Neutron Star Radio Emission Zebra Pattern Astrophysics
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