The collision of clusters of galaxies causes an “explosion” of 6.5 million light years!

The South African MeerKAT radio telescope is the precursor to the telescope square kilometer array (SKA), a massive radio telescope project consisting of several interferometric networks in metric and centimeter wavelengths and which will have an aggregated surface equal to one square kilometer. This has made it possible to study the shock wave produced by the collision of clusters of galaxies that span more than 6.5 million light-years.

like a part standard cosmological modelThe Gravity specific to dark matter because of that Collapse Very early in the history of the observable universe, there was a collapse of normal matter that gave rise to galaxies. These, in turn and always follow the concentration dark matterThe filaments will also gather into cluster of galaxies Containing hundreds or thousands of galaxies.

The observable universe is certainly expanding, but, as it is at the level of Solar System or some Stars In galaxies, this expansion is sometimes thwarted by the gravitational force of matter until it is also overpowered by its repulsive effect.dark energy, This is the reason that Andromeda Galaxy will eventually hit Galaxy and what we see for example Hubble not only collide with galaxies Titanic collision of clusters of galaxies,

The Meerkat network of radio telescopes in South Africa enables continuous detection of radio emissions from an extraterrestrial civilization within the framework of the SETI program. To get a fairly accurate French translation, click on the white rectangle at the bottom right. The English subtitle should then appear. Then click on the nut on the right side of the rectangle, then on “Subtitles” and finally click on “Translate automatically”. Select “French”. © Berkeleysetti

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Shock waves that indirectly radiate electrons

A few years ago, a new network of radio telescopes was inaugurated in South Africa. this is Meerkat and it is made of 64 parabolas radio The individual is 13.5 m in diameter and spread over an area of ​​8 km. Today, a team of radio astronomers who have used data from this instrument have revealed that they provide the most detailed images of a shock wave, compared to the explosion in the space medium after the collision. after which Merger One of the two groups of galaxies that gave birth to the Abell 3667 group about a billion years ago.

The cluster is mentioned in the list of stars of the same type whose formation was initiated byastronomer American George Ogden Abel who published the first edition in 1958. It now includes more than 4,000.

It appears clearly on images in the radio domain that the formation of Abell 3667 was therefore equivalent to a supersonic boom in the intergalactic medium and hot plasma that bathes the cluster. The main structure observed is about 6.5 million . extends tolight year, Remember that the visible disk of our galaxy made up of stars is only 100,000 light-years in diameter. One can measure what the extent of the shock wave represents by looking at part of the X-ray image. photography synthetic from above to false colour’s, Details of the researchers’ findings regarding Abel 3667 are available in a paper filed here arXiv,

The article’s lead author, Francesco de Gasparin (University of Hamburg and INAF), explained the structures revealed by the meerkat images in a statement. South African Radio Astronomy Observatory (Sarao) that they ” Full of surprises and more complicated than we initially thought. Shock waves act like giant particle accelerators the speed electrons close to speed speed of light, When these fast electrons pass through a magnetic field, they emit radio waves that we see ,

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