An international team of astronomers has discovered a second persistently active fast radio burst, questioning the nature of the mysterious phenomenon.
Fast radio burst (FRB) is an intense, short flash of radio frequency radiation that lasts on the order of milliseconds. This phenomenon was discovered in 2007 by graduate student David Narkevic and his supervisor Duncan Lorimer. The source of these very energetic events is a mystery, but clues about their nature are gradually being gathered.
A new source, the Fast Radio Burst 20190520B, was detected by the 500-meter Spherical Radio Telescope (FAST) in Guizhou Province, China on May 20, 2019, and was discovered in November data of that year. (Opens in a new tab)Report.
Follow-up observation by Jansky Super Large Array A California Institute of Technology-led (VLA) program has discovered weaker, constant radio radiation associated with the Fed. Subaru Telescope Localize the sauce within the dwarven fringe in Hawaii Galaxy About 3 billion light-years from Earth..
Related: “Radio Color” from the mysterious flash of deep space reveals a lonely stellar corpse as a source
In particular, after the Fed 121102 was localized in 2012, it is the second discovered repetitive Fed that has been associated with Persistent Radio Sources (PRS).
Casey Law, an astronomer at the California Institute of Technology and co-author of the VLA program, told Space.com:
“Probably the first such association [between an FRB and radio source] It was a coincidence because it was difficult to explain. The second example shows that this is a realistic and important part of the Fed’s lifespan. “
This finding raises new questions about the nature of the Fed, such as whether the Fed’s sources evolve over time, or whether different types of sources can release the Fed.
“One of the key questions in the field of the Fed is whether all Fed sources are repeated,” said Di Li of the National Astronomical Observatory of China (NAOC), leader of the Commensal Radio Astronomy FAST Survey (CRAFTS), which detected the Fed 190520B. He said there was. Space.com by email. “I personally like evolution in that all sources are repeated, but as the sources get older, the level of activity drops sharply. FRB20190520B is about the known Fed with so-called PRS counterparts. It’s just the second of the 500, and both are very active. This fictional theory of evolution can represent the youth of the Fed, but it doesn’t last that long. “
Another special feature of the Fed 190520B is its variance measurement. This indicates that its emission passed through the highest density electrons of any Fed before it was observed on Earth. This suggests that the Fed is active in the local plasma environment. SupernovaAnd the newly created source.
While providing environmental insights for the Fed 190520B, the significant differences in variance measurements with other Feds cast doubt on their use as a “cosmic reference” for measuring distance.
Franz Kirsten, a postdoctoral fellow at the Dutch Institute of Radio Astronomy (ASTRON) and the University of Chalmers, Sweden, who was not involved in the study, told Space.com that the path of evolution of the FRB is possible, but these two It is difficult to understand only from the information source.
“We need to find more and constrain this evolutionary model. To say it’s okay, we really need more at different ages. This is always going away.” Carsten said. “So it’s really nice to see if these persistent sources were actually declining over time, for example on a 10-20 year timescale.”
To follow up on this study, Yu Wenfei, co-author of the Shanghai Astronomical Observatory, told Space.com: And to solve. “
“I’m optimistic that the Fed’s puzzles will be solved by investigating such extreme Feds,” Yu said.
Di also finds high value in the repeated discovery of Fed sources, for example. Hubble Space Telescope For follow-up observation.
As with the Fed 190520B, cooperation between astronomers and institutions around the world is essential to discovering, identifying and characterizing these mysterious phenomena.
“This discovery is not possible without international cooperation. Only FAST has discovered and only VLA can localize it very efficiently. Each device has its strengths and we all have one sky. I have, “Di says.
the study (Opens in a new tab) Today (June 8th), it was published online in the journal Nature.
Follow us on Twitter @Spacedotcom (Opens in a new tab) or Facebook (Opens in a new tab)..