This is one of the reasons for the designAtacama Large Millimeter/Meter Matrix (Alma). Another, complementary, is that networkConstructed in this way makes it possible Thus getting a very large virtual instrument without having to create it.
In this artist’s video, two neutron stars of low dimensions but very high density are about to merge and explode into a kilonova. This particularly rare event results in the emission of gravitational waves and short bursts of gamma rays. Emissions were observed on August 17, 2017, respectively by Ligo-Virgo and Fermi/Integral. Numerous detailed observations made using ESO telescopes confirmed the nature of this object – a kilonova – located within the galaxy NGC 4993, about 130 million light-years from Earth. This type of thing is the main source of heavy chemical elements, such as gold and platinum, in the universe. © ESO
Colliding neutron stars that produce gold and platinum
This time , which speaks of the observed GRB 211106A short gamma-ray burst – like its name Gamma Ray Burst on November 6, 2021. As in the case of the gravitational wave source (gravity wave) observed on August 17, 2017, that the collision between neutron stars arises from the fact that the two The planets lost energy in the form of gravitational waves faster and faster, causing them to fall relentlessly and faster and faster towards each other.Publish an article in Astrophysical Journal Letterswhich is a free version available at
The flow of particles and gamma photons by injecting themselves into the interstellar medium excites and propels themContains, to shine in response. It’s this radiation which was first discovered in the accessible spectral range by ALMA. Before this tool, Millimeters were not sensitive enough to detect these auroras, as GRBs are often observed at billions of subordinate . So we only observe ancient GRBs and also think that for some reason still unknown, they were more abundant during the first billion years of the universe’s history. In fact, GRB 211106A occurred while a coil It was only observable 40% of its current age. However, even if a kilonova is clearly visible from afar in gamma, this is no longer the case for the less bright residual radiation.
Initially, when the X-ray isotope of GRB 211106A was only discovered using satelliteastrophysicists thought the kilonova could still come from a neighboring galaxy, although we couldn’t relate it to it. Across Visible observations with Hubble – probably because there is a large amount of dust on the line of sight near the GRB.
But finally, thanks to Alma, it was possible to find a faint and distant galaxy where the gamma-ray burst occurred. The distance at which it was determined, it was necessary to conclude that it was one of the most powerful GRBs discovered so far …
Epic detection GW170817. For a fairly accurate French translation, click the white rectangle at the bottom right. The English translation should then appear. Then click on the nut to the right of the rectangle, then click on “Subtitles” and finally on “Translate automatically”. Choose “French”. © Science vs Cinema
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