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Un extrait d'une simulation d'un trou noir supermassif binaire avec ses disques d'accrétion. © Nasa’s Goddard Space Flight Center

The closest pair of supermassive black holes known so far

Supermassive black holes are found everywhere in the visible universe. They are sometimes found in pairs in a galaxy, to the point of forming a binary supermassive black hole. The closest found so far has been found less than a hundred million light-years away from the Milky Way.

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There is no longer any doubt that the vast majority of galaxies are occupied at their center with a star Built-in everything indicates that it is a really supermassive black hole. Caution is still required because, In the strict sense of the word, if these things string balls or some wormholes, for example, and thus, without event horizon, they are not true black holes according to the strict definition you use Physicists Since the work of the Nobel Prize physique Roger Penrose In particular.

The origin of these supermassive black holes is still a bit mysterious, but we have reason to believe that one of these black holes growth factors One of these objects is their merging during the collision of galaxies. However, it’s not clear that these galactic mergers will systematically deposit their own massive black holes into the center of the news. galaxy So much so that they combine fatally.

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However, we not only watch galactic mergers, but also Binary supermassive black holes in the last galaxy. We should know more about this when it is eLisa gravitational wave detector will be in orbiting around the sun on the 2035 horizon.

L ‘who – which We made an interesting announcement today about these supermassive black holes by revealing it, thanks very large telescope From the European Southern Observatory (VLT from ESO) and the Muse Tool (multi-unit spectrophotometer) that were processed at the Paranal Observatory in Chile, the closest pair of such objects known to date have been discovered.

It is found in the galaxy NGC 7727, in the constellation Aquarius, about 89 millionlight years from Milky Way. As a bonus, they are also the least distant supermassive black holes known from each other with a relative distance of only about 1,600 light-years.

Supermassive black holes merging in 250 million years

« This is the first time we’ve found two supermassive black holes so close together, less than half the distance between the previous record holder. “,” explains in the Eso . press release Karina VogelAnd astronomer at the Strasbourg Observatory and lead author of the study published online today.

The two stars will eventually merge into a single supermassive black hole as explained by Holger Baumgardt, a professor at the University of Queensland in Australia and co-author of the publication in Astronomy and astrophysics : « Weakness Separation and the Speed of two black holes indicating that they will merge into one supermassive black hole, likely within 250 million years ».

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NGC 7727 itself appears to be the product of a galactic collision that occurred about a billion years ago Door still scars From this event in the form of irregular structures and remnantsstars produced by tidal forces. As for the black holes themselves, their effects on them movements From the nearby stars indicate that the largest is located in the heart of the galaxy, its weight is about 154 million Mass Solar but only 6.3 million for its companion. Remember that our galaxy contains about 4 million.

using very large telescope European Southern Observatory, astronomers have revealed the closest pair of supermassive black holes ever observed to Earth. This video summarizes the discovery. 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”. © European Southern Observatory (which – which)

Karina Vogel explains that this ” The discovery indicates that there could be more remnants of galactic mergers and that it could contain many hidden massive black holes still waiting to be discovered. This could increase the total number of supermassive black holes by 30% in the worldUniverse Sweetened ».

That prediction should soon be testable, co-author Steffen Mieske, an ESO astronomer in Chile responsible for ESO’s Paranal Science Operations, continues to explain in the Eso press release.

« The discovery of this pair of supermassive black holes is just the beginning. With the Harmoni tool onELTWe will be able to make discoveries like this far beyond what is currently possible. The’ELT From ESO will be integral to understanding these things ».

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This digital simulation brings astrophysicists one step closer to understanding the types of light signals produced when two supermassive black holes collide with matter, which is millions to billions of times the mass of the Sun, in a collision. This simulation incorporates the physical effects of Einstein’s general theory of relativity and shows that gas in such systems will glow mainly in ultraviolet and X-rays. For a fairly accurate English 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”. © NASA’s Goddard Space Flight Center

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