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Pulsars are typically identified from their faint pulse, flickering periodically. But in the case of PSR J0523−7125, its pulse is so wide and bright that it didn’t fit the typical profile of a pulsar and was dismissed as a galaxy.
Wang and the team first suspected that the object might be a pulsar on the basis of data from the Variables and Slow Transients survey, conducted using the Australian Square Kilometre Array Pathfinder telescope in Western Australia. The survey looks at part of the sky for highly variable radio-wave sources.
Emissions from pulsars are often highly polarized, and some of them oscillate in a circular way. Few space objects are polarized like this. Using a computer programme, the team blocked out wavelengths of light that were not circularly polarized, revealing the pulsar. “We should expect to find more pulsars using this technique. This is the first time we have been able to search for a pulsar’s polarization in a systematic and routine way,” said co-author, Tara Murphy, a radio astronomer at the University of Sydney in Australia, in a press release.
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