Astronomers working on the Atacama Large Millimeter Array (ALMA) and studying the electromagnetic spectrum through the cosmos encountered a gamma-ray burst (GRB) and the birth of a black hole as the massive star it had once lost billions of years ago long fight with gravity. The ensuing supernova and subsequent GRB are among the largest and most energetic events in the universe.
The event, recorded by ALMA astronomers, was about 2 billion light-years away, according to a report by Northwestern University. This newborn black hole, which ate through the remaining matter of the star, literally belched a fast but incredibly intense gamma-ray flash on Earth, where NASA's Neil Gehrel Swift Observatory discovered it for the first time in December 201
Astronomers realized that the rebound caused by the strong explosion of the GRB crashed into the surrounding debris and it took much longer than initially expected. These observations give researchers new insights into the complicated physics of GRBs.
Gamma rays from the explosion are reported to have disappeared only seven seconds after their appearance, but longer wavelengths of light from the supernova – including X. For a few weeks, the rays, visible light, and radio were on. The event, known as GRB 161219B, has been observed by several observatories around the world, including the X-ray telescope aboard the Neil Gehrels Swift Observatory, the United Kingdom Infra Red Telescope, the Very Large Array and ALMA, the report said. 19659002] The observations made by all made it possible for a team of astronomers, including astrophysicists Wen-fai Fong and Raffaella Margutti, to produce ALMA's first time-lapse movie of a cosmic explosion that led to the formation of a young black hole
The "cosmic Film "showed a long-lasting echo like sound at radio wavelengths, known as reverse shock, notes the report.
"With our current understanding of GRBs, we would normally expect a reverse shock to last only a few seconds," said Tanmoy Laskar of the National Radio Astronomy Observatory (NRAO), who led the study. "This took a good part of a whole day."
An inverse shock occurs when star particles and dust are blown away because of a strong gas leak as it enters the surrounding gases. This slows the escaping material so much that a shock wave is actually sent back into the drain.
"A reverse shock that returns to the outflow of the explosion is like a strong light bulb illuminating the interior of the explosion, making this event unique," said Margutti, one of the researchers involved in the study.
This study was first published in the Astrophysical Journal.