Matter outflows in the form of jets are observed in astronomical systems at varying speeds, ranging from fast to slow. Jets in the form of matter outflows are commonly observed in astronomical systems at varying speeds, ranging from fast to slow. The quickest jets are highly relativistic and can rea
One of the main open questions in the study of gamma-ray bursts is why in a significant percentage of cases, X-rays, which are visible for up to several days, do not fade for a long time. To answer this question, the researchers began a careful mapping of the data, which are numerous but scattered and “noisy”.
They discovered that changing just one assumption, about the initial speed of the jets, was sufficient to explain the data. The researchers continued and examined the data that led other astrophysicists to conclude that the jets must be highly relativistic , and discovered, to their surprise and delight, that none of the existing arguments was valid in the cases they studied. From there they quickly concluded they were most likely in the right direction.
“Astrophysical systems in general are characterized by great complexity, and often theoretical models, inherently more simplistic, may miss key points,” he explains. “In many cases, careful examination of the data, as we performed here, shows that existing ideas simply don’t work. This is what led us to come up with new ideas. Sometimes the simplest, least complex idea is sufficient.”
“It took us a while to develop the understanding, and once I realized that one parameter in total needed to be changed, everything worked out just like a puzzle,” Prof. Pe’er says. “So much so that from some point, every time we brought up a new potential problem, it was clear to me that the data would be in our favor, and, indeed, they were.”
France Dernières Nouvelles, France Actualités
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