Exact measurements from the NSF radio telescope collection showed that a narrow jet of particles moving at almost the speed of light escaped into interstellar space after a pair of neutron stars merged at a distance of 130 million light years from us. The event was recorded in August 2017, as we received gravitational waves oscillating in space.
Consequences of the merger of two neutron stars. An ejection from the initial break formed a shell around the black hole created by the merger. The stream of material moving from the disk first contacted the material of the release, creating a wide cocoon. She later burst into interstellar space
The effects of the fusion (GW170817) were observed by orbital and ground-based telescopes around the world. The researchers saw how the characteristics of the waves changed over time, so they used these transformations as a clue to the nature of the phenomena following the merger. Most of all, scientists were interested in whether the event created a narrow fast stream of material that made its way into interstellar space. This is important, because such jets are needed to create bursts of gamma radiation, which are formed (according to theorists) during the merger of neutron stars. The answer came from the combination of VLBA, VLA and GBT data, which showed that the radio outburst was present and moving at tremendous speed. Scientists measured apparent motion that turned out to be 4 times faster than the speed of light. This illusion is called superluminal motion, which occurs when the jet is directed almost toward the Earth, and the material is gaining almost light speed. The observation was carried out 75 days after the merger, and then another 230 days later. The jet is narrow and does not exceed 5 degrees wide. It is directed at 20 degrees from the direction of the Earth.
The artistic vision demonstrates the moment when the jet from the event of a neutron star merging went out into space. Within 155 days between two observations, the jet shifted by 2 light years (the illusion of superluminal motion, since the jet is directed almost to the Earth and reaches 97% of the speed of light)
The scenario suggests that the initial fusion of two superdense neutron stars triggered an explosion, which pushed the spherical shell of the fragments out. Neutron stars collapsed into a black hole, whose powerful force of gravity began to attract material. The latter formed a rapidly rotating disk that generated a pair of jets moving outward from the poles. The data show that the jet interacted with the garbage, creating a wide cocoon of material expanding outward. It will expand more slowly than jets. It turns out that the cocoon dominated radio emission up to 60 days after the merger, and in later periods jets affected emissions.
The detection of a fast moving jet in GW170817 greatly enhances the link between neutron star fusions and short-term gamma-ray bursts. It is also incredibly important that we managed to fix this phenomenon in the radio frequency part of the EM spectrum, because it is much easier to understand the mechanism of the jet.