Astronomers have detected a fast, mysterious radio that repeats itself from a dwarf galaxy 3 billion light-years away.
The cosmic object is distinctive compared to other radio burst detections in recent years, according to new research.
Watch the video above to see the first time a fast radio blast was found to its source
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Rapid bursts of radio, or FRBs, are bursts of radio waves lasting milliseconds into space.
Individual radio bursts are broadcast once and are not repeated. But it is known that repeated fast radio bursts emit short, energetic radio waves several times.
Astronomers have been able to track some radio bursts to their home galaxies, but have yet to determine the true cause of the pulses.
Learning more about the origins of these bright, intense radio broadcasts could help scientists understand what causes them.
Astronomers detected the object, called FRB 190520, when it launched a radio wave burst on May 20, 2019.
Researchers used the five-hundred-meter aperture spherical radio telescope (FAST) in China and discovered the explosion in telescope data in November 2019.
When they made tracking observations, astronomers noticed something unusual: the object was releasing frequent, repeated bursts of radio waves.
Artistic concept of a neutron star with an ultra-strong magnetic field, called a magnetic field, that emits radio waves (in red). Credit: Bill Saxton / NRAO / AU / NSF
The team used the National Science Foundation’s Karl G. Jansky Very Large Array (VLA) telescopes in 2020 to identify the source of the explosion before concentrating on it with the Subaru Telescope in Hawaii.
Subaru’s observations in visible light showed that the explosion came from the outskirts of a distant dwarf galaxy.
A study detailing the findings was published Wednesday in the journal Nature.
Two of a kind
VLA observations also revealed that the celestial object was constantly releasing weaker radio waves between repeated bursts.
This is very similar to just another known repeated rapid burst: FRB 121102, discovered in 2016.
The initial detection and subsequent tracking of FRB 121102 to its point of origin in a small dwarf galaxy more than 3 billion light-years away was a breakthrough in astronomy.
It was the first time that astronomers were able to know the distance and environment of these mysterious objects.
This image, captured by the Karl G. Jansky Very Large Array, shows the FRB 190520 object when it is active (in red). Credits: NRAO, Bill Saxton / NSF, AUI, CFHT
“Now we have to explain this double mystery and why FRBs and persistent radio sources sometimes come together,” said Casey Law, co-author of the study and a staff scientist at the California Institute of Technology.
“Is it common when FRBs are young? Or maybe the bursting object is a massive black hole that is being eaten disorderly by a neighboring star?
“Theorists have a lot more details to work on now and the scope of the explanation is shrinking.”
It is currently known that less than 5% of the hundreds of identified fast radio bursts are repeated and only a few of them are active regularly.
But FRB 190520 is the only persistent asset, meaning it has never been “extinguished” since it was discovered, said the study’s author and the National Astronomical Observatories of China and the chief scientist. from the FAST Operation Center Di Li radio division.
Meanwhile, FRB 121102, “the first known famous repeater, can be turned off for months,” Li said.
New questions for FRBs
The latest findings raise more questions because astronomers are now wondering if there could be two types of fast radio bursts.
“Are those who repeat different from those who do not? What about persistent radio broadcasting, is it common? “Kshitij Aggarwal, a co-author of the study involved in the study as a doctoral student at the University of West Virginia, said in a statement.
It is possible that there are different mechanisms that cause radio bursts, or that what produces them behaves differently during the different stages of evolution.
Previously, scientists hypothesized that fast radio bursts are caused by the dense debris left behind by a supernova, called a neutron star, or neutron stars with incredibly strong magnetic fields called magnets.
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FRB 190520 was being considered a possible “newborn” object because it was in a dense environment, Law said.
This environment can be caused by the material released by a supernova, which led to the creation of a neutron star.
As this material spreads over time, the bursts of FRB 190520 may decrease as it ages.
From now on, Li wants to discover faster radio bursts.
“A consistent picture of the origin and evolution of FRBs is likely to emerge in a few years,” Li said.
Law is excited about the implications of having a new class of radio wave sources.
“For decades, astronomers thought there were basically two types of radio sources we could see in other galaxies: the growth of supermassive black holes and the formation of stars,” Law said.
“Now we’re saying it can’t be a categorization anymore either!”
“There’s a new kid in town and we should keep that in mind when we study the populations of radio sources in the universe.”