For a decade, Earth has been on the receiving end of enigmatic occurrences. radio emissions every two hours.
Following over ten years, the origin of these signals has at last been pinpointed near the constellation of the Big Dipper.
A study published in Nature Astronomy reveals a close pair of stars—a red dwarf and a white dwarf—that orbit each other so closely that their magnetic fields interact with each other every two hours, producing detectable radio emissions during these collisions.
The finding is unexpected for researchers, who until now had solely been able to link radio bursts to neutron stars.
Doctor Iris de Ruiter, who headed the research, said 'We collaborated with specialists from various fields within astronomy.'
'Using various methods and insights, we gradually moved nearer to solving the problem.'
Researchers have managed to capture a particular type of radio signal from a galaxy that’s approximately 9 billion light-years from our planet.
The signal did not originate from aliens; instead, it came from a star-forming galaxy known as 'SDSSJ0826+5630', which existed when the universe was approximately 4.9 billion years old.
The uniqueness of this radio signal lies in its specific wavelength, referred to as the '21 cm line'.
'It's like looking back in time for 8.8 billion years,' explained Arnab Chakraborty, a cosmologist and co-author of the study on this discovery.
This kind of radio signal had never before been observed at such an immense distance.
In 2022, comparable radio signals guided scientists to the detection of a neutron star. a star differing from any discovered before.
Unusual pulses lasting approximately 300 milliseconds each were observed by Manisha Caleb, who is a lecturer at the University of Sydney.
'The flash exhibited traits similar to those of a radio-emitting neutron star. However, this was unlike anything we had encountered previously,' she said. said .
A neutron star represents the condensed remnants of a large supergiant star. Aside from a black hole, they stand as the most compact and dense celestial bodies identified by humans.
When they are particularly dense, these objects can be referred to as pulsars – and frequently are. release pulses of radio waves that we can detect on Earth.
It was discovered that the neutron star emitted pulses never observed before.
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