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Mysterious Fast Blast Radio comes in two different flavors.



The CHIME radio telescope at the Dominion Radio Astrophysical Observatory in Caleden.  British Columbia, Canada

The CHIME radio telescope detected 535 radio bursts in its first year of operation.Credit: Andre Renard/CHIME Collaboration.

A radio telescope in Canada detected 535 rapid radio bursts, four times the shorter phenomenon. with these high powers all at once The long-awaited results show that these mysterious events are of two different types. Most explosions are one-time. and a minority of events that repeat sporadically and at least ten times longer than usual

research results1

It is strongly suggested that the rapid radio explosion could be the result of at least two different astrophysical phenomena, study co-author Kiyo Masui. An astrophysicist at the Massachusetts Institute of Technology in Cambridge said: “I think this is just reinforcing that there are differences.”

The overnight jump in available data leaves the radio astronomy community dizzy, says Laura Spitler, an astrophysicist at the Max Planck Institute for Radio Astronomy in Bonn. Germany said, “I woke up this morning and the entire Slack channel was full of people talking about the report.”2 In 2016, using the Arecibo telescope that collapsed in Puerto Rico.

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) gathered events in the first year of operation between 2018 and 2019. The team announced their results during a virtual meeting of the American Astronomical Society on June 9. and has posted four pre-printed editions on the arXiv online repository.

repeater and one time

CHIME is located near Penticton in British Columbia. It is a telescope with no moving parts. It consists of four half-tube antennas, each 100 meters long, at any given time. It will notice a narrow bar. of the sky above But when the world turns The telescope will scan the sky. and a digital processing chip collects the signals to create an image.

CHIME was originally created to map the distribution of matter in the universe. But more sophisticated electronic kits have been added to the design to enable fast radio reception as well. Spitler recalls that many workers in the field had doubts about the telescope’s potential to detect explosions. But the latest announcement has proved it. “They’re really following the prophecy,” Spitler said. “It was very impressive.”

As the jury continues to consider the causes of rapid radio bursts, CHIME’s results appear to help cement the idea that there are at least two different types. Sixty-one out of the 535 detected as ‘duplicators’- It comes from 18 sources that have been witnessed several eruptions. The two groups differed in duration. A single incident lasts much shorter. The repeater also emits radio frequencies that are narrower than single-burst radio frequencies.

“It’s the most compelling evidence that there are two populations,” Spitler said.

until recently The evidence for this is not entirely clear. Some astronomers have argued that non-recurring eruptions may just be repeated eruptions that have not been observed long enough to see another explosion. “It doesn’t mean that this phenomenon is completely different. But it could be,” Masui added.

Illustration of a neutron star merger known as GW170817 detected Aug. 17, 2017.

A catastrophic event, such as the collision of two neutron stars, may be the source of non-repeating rapid radio bursts (illustrations).Credit: NASA/CI Lab’s Goddard Space Flight Center.

Radio frequencies bursts are usually detected for more than a second or more. But this period is misleadingly long: as the signal travels millions of light-years of space. Matter in space therefore tends to transmit radio waves across the spectrum. As a result, low-frequency waves can reach Earth with a delay of several seconds compared to high-frequency waves. The researchers calculated that at the source Radio emissions usually only take milliseconds. during that time The source of the explosion can release 500 million times more energy than the Sun in a similar time period.

The extent of the ‘dispersion’ of this wavelength is a rough indication. So far, all the explosions have been shown to come from other galaxies. Except for one incident that happened in the Milky Way.

The CHIME team reported that the source of the explosion appeared to spread across the sky. Only a handful of people were able to trace a specific galaxy.

origin theory

in the past few years Researchers have been monitoring certain areas of the sky that have caused explosions in the past. and in some cases, it has been observed to recur sporadically. For example, the ‘repeater’ discovered by Spitler and his collaborators in 2016 has a cycle of activity lasting about a day or so. which explodes several times an hour and repeats every 160 days

This usual iteration has some clues as to what might have been the cause of the explosion. One possible explanation, Spitler said, is that repeaters may occur when a highly magnetic neutron star orbits a normal star in an elongated orbit. When a neutron star comes close to a neighboring star periodically The eruption may be the result of a magnetic field scattered by the high-energy stellar winds.

On the other hand, non-replicators can result from catastrophic events such as collisions of neutron stars or magnetic storms in young neutron stars called magnetars. Milky Way events linked to known magnets But the magnetar theory was questioned by the discovery of explosions from A ‘globular cluster’ in galaxy M81 recently.3. Globular clusters are dense clusters of older stars. and is deemed unlikely to be the host of magnetars

The discovery of the first rapid burst of radio waves in 2007 shocked researchers. And over the years, only a handful of people have known, Masui recalls. Theorists have many possible explanations. And the joke is that theory outnumbers real events. Now, CHIME has reversed that trend, he says, “I don’t think theorists can catch up with us.” And this first catalog is just the beginning: because it’s compiled. So the team continued to detect many more rapid radio explosions. and will continue to be published in the years to come.


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