to split, to tear
A Canadian telescope picks up an unusual signal from the universe. The researchers determined that the mysterious signal had a “heartbeat”.
Cambridge – The infinite expanses of the universe are incredibly wondrous and beautiful, Also shown are the first images from the James Webb Space Telescope But researchers are far from figuring it all out. A phenomenon that cannot be fully explained is what is known as “fast radio bursts” (abbreviated FRB). The term describes a very short wave (a few thousandths of a second in length) of radio radiation of unknown origin in space. In 2007, the first FRB was discovered, and since then hundreds of such fast cosmic flashes have been reported from different corners of the universe. But many questions about the mysterious signals – like how they appeared or where they came from – remain unanswered to this day.
Researchers at the Massachusetts Institute of Technology (MIT) in Cambridge are now reporting an exciting radio burst from a distant galaxy. The mysterious new signal lasted up to three seconds, about 1,000 times longer than the average fast radio burst. During this time window, the researchers were able to identify another characteristic: bursts of radio waves repeating every 0.2 seconds in a distinct periodic pattern – “similar to a beating heart”, according to a statement from Massachusetts. Institute of Technology.
A mysterious signal from the universe: “Boom, boom, boom – like a heartbeat”
“It was unusual,” recalls Danielle Mitchell, who discovered the signal as part of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) in 2019. The researcher explains her discovery: “Not only it was very long at about three seconds, but there were also these periodic spikes that were remarkably precise and happened in a split second – boom, boom, boom – like a heartbeat.
The signal, designated FRB 20191221A, is believed to be complex, the longest-lived fast radio wavelength with the clearest periodic pattern detected to date. The mysterious signal seems to come from a galaxy billions of light years from Earth. What exactly is the source of the signal is a mystery to researchers. However, they suspect that a radio pulsar or magnetar – both types of neutron star – could be behind it.
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Unknown signal from space: “Magnetar or pulsar on steroids”
“There aren’t many things in the universe that emit strictly periodic signals,” notes Micheli, who led the study of the strange signal. The researcher continues: “In our galaxy, for example, we know of radio pulsars and magnetars that rotate and emit a beacon-like emission beam”, adding: “We believe that this new signal could be a magnetar or a pulsar on doping. ”
Micheli’s research team hopes to discover more periodic signals from a previously unknown source in order to use them as a sort of astrophysical clock. Researchers are particularly interested in the frequency of epidemics and their evolution. As the universe expands, the source of the signal moves away from Earth – researchers can use the variable frequency to measure how fast the universe is expanding.
It was unusual. Not only were they very long at around three seconds, but there were periodic spikes that were remarkably accurate and happened in a split second – boom, boom, boom – like a heartbeat.
A mysterious “heartbeat” signal from the universe: Incredibly bright and long
The unusual fast radio burst was discovered by Micheli and his team Published in the journal Nature. In their study, the researchers showed that there are similarities with the emissions of radio and magnetic pulsars in our Milky Way. But there is also a big difference: FRB 20191221A seems to be a million times brighter. Micheli thinks the flashes of light could be coming from a distant orb that is usually less bright but, for some previously unknown reason, emitted a series of very bright explosions in a rare three-second window.
The researchers already know some things about the mysterious signal and its source: “Based on the properties of this new signal, we can say that there is a cloud of plasma around this source, which must be very turbulent”, explains Michelle. Additional bursts of the signal could help better understand the source and the neutron stars. Michilli sums up the questions researchers are asking: “This discovery raises the question of what could be causing this extreme signal that we have never seen before and how we can use this signal to study the universe. .” (Tongue)