Sthe scientist We have discovered very active and repetitive fast radio bursts (FRBs). This is just the second example of this kind, implying a picture of the evolution of these mysterious cosmic events.
The Fed is the brightest millisecond-duration astronomical transient in the radio band of unknown origin. It has been confirmed that less than 5% of what has been detected so far is repeated, and only a few are permanently active.
An international team led by an astronomer at the National Astronomical Observatory of the Chinese Academy of Sciences (NAOC) discovered and localized lively repetitions using a 500-meter spherical radio telescope (FAST), also known as the “China Sky Eye.” A fast radio burst called FRB20190520B in a low-metal dwarf galaxy about 3 billion light-years away from Earth.
After that, we continued observing with telescopes such as the super-large interference radio telescope, Palomar telescope, Keck telescope, Subaru telescope, Canada, France, and Hawaii telescope, and confirmed FRB20190520B.
Scientists said the FRB20190520B appears to be in a complex plasma environment resembling a superluminous supernova, suggesting that it may be a “newborn”.
After the discovery of the first repeater Fed20121102A in 2016, a highly active Fed with repeated bursts between bursts from a compact area and sustained radio radiation, according to a study published Wednesday in the journal Nature. The second example of.
Researchers say that the differences between the two Feds and all the other Feds suggest that two different types of Feds may exist.
Currently, candidates for FRB sources are ultra-dense neutron stars that remain after a giant star explodes as a supernova, or a neutron star with an ultra-strong magnetic field called a magnetar.
Astronomers have stated that there are two different mechanisms, or the objects that produce them can behave differently at different stages of evolution.
“We further assume that FRB20121102A and FRB20190520B represent the early stages of an evolving Fed population,” said LiDi and NAOC, co-authors of this paper.
“A coherent picture of the Fed’s origins and evolution could be revealed in just a few years,” Li said.
Located in the naturally deep and round karst terrain of Guizhou Province in southwestern China, FAST officially went into operation in January 2020 and was officially opened to the world on March 31, 2021. It is considered to be the most sensitive radio telescope in the world. Xinhua