The gamma-ray bursts are the brightest and most powerful explosions in the Universe. Scientists not much is known about their nature, however, a group of researchers from the University of Charleston (USA), who studied the data from several such events argues that they contain anomalies that may be interpreted as the inverse over time. According to scientists, their observations do not allow us to say this with complete certainty, but we note the phenomenon does not describe any one theoretical model, the article of the Astrophysical journal.
For the first time gamma radiation was discovered in 1968 by us satellites destined for the registration of Soviet nuclear tests. Scientists can’t accurately say what’s causing it, but see today duration gamma-ray bursts can vary from a few milliseconds to several hours.
Thanks to the discovery of gravitational wavescreated by colliding neutron stars, we can discover at least one of their probable sources. However, astrophysicists argue that these sources must be much more. The assumed gamma-ray bursts can be the echoes of at least several space disasters: the transformation of very massive stars in compact neutron stars or quark stars (hypothetical objects, never discovered), or in black holes, supernovae and simultaneously giving birth gipernovae.
The complexity in the study of gamma-ray bursts is that to define them we can only when their beams are moving directly in our direction. This is the emission of gamma radiation (fortunately) happen in several billion light years from us, therefore, to predict their appearance, we are not able. And observation requires the use of very sensitive equipment, often optical sense, therefore is not excluded the problem of the presence of noise contained in the signal of outbreaks. And yet this does not mean that by themselves flash difficult to detect. Just the opposite. Such an event is very difficult not to notice. For example, only one orbital Observatory SWIFT space Agency NASA for the period from 2004 to 2015 year found about 1000 bursts of gamma radiation in different parts of the world.
A team of astrophysicists from the University of Charleston under the guidance of John Hakkila decided to analyze the data of six of the brightest gamma-ray bursts observed between 1991 and 2000, using the BATSE instrument of the Compton Observatory (USA) dedicated to the study of gamma-radiation. In the study, researchers have discovered a new and unexpected detail of gamma-ray bursts. Depending on which telescope (with low and high sensitivity) were monitored during these events, the spectrum of these cosmic phenomena looked different. The researchers noted that the extremely high brightness of gamma-ray flares may smear their range, hiding certain details in its structure, is able to tell what causes these phenomena.
Data analysis all six of the outbreaks showed that they possess a complex structure, not like a typical flat spectrum gamma-ray bursts. While in their signals contained anomalies that turned out to be impossible to explain from the position of any theoretical model. These signals represented the special wavy structure, which was rotated in time as if their beginning was in the end of the outbreak, and the end — in the first moments of the explosion of a star.
“We do not claim that this phenomenon does exist in reality and violates the laws of causality. It is possible that the radiation generated particle beams or shock waves, colliding with the blast of gamma radiation and reflected back. And the script does not describe any one theoretical model”, says John Hakkila.
To check for errors and coincidences scientists once again cleared the data from the noise, but the static analysis confirmed the correctness of the calculations indicate the presence of a not yet known to us processes in the birth of gamma-ray bursts.
Scientists put forward several assumptions seen. In addition to the impact on jet something similar, as noted by Hokilla may occur if the flash light will pass through a gravitational lens, generated by a newborn black hole. In addition, similar signals may be observed if the emission of gamma radiation will pass through several giant ring-shaped structures of gas surrounding the dead star.
To find out which option is correct will help new observations of other gamma ray bursts and the study of such anomalies, the researchers note.