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“It was a real surprise to see”: These ancient, very bright galaxies have no place where they are

Very old, very bright galaxies in the nearly empty regions of our universe? The models do not consider this. And yet…

The one who AstronomersAstronomers Call quasars – for “half stars”understand “Almost Star” – Galaxies actually have very bright cores. Because there are supermassive black holes lurking there that release enormous amounts of energy as they swallow gas and dust. What is interesting to the researchers is that such bright and massive objects could have existed only after a few hundred million years. The Big BangThe Big Bang. They don’t really know how they are formed. But they assume that these quasars originated in dense regions.UniverseUniverse Early regions in which we found some other galaxies. small

So a team of astronomers was surprised when they discovered in images recently sent back by the James Webb Space Telescope that some of the oldest quasars in the universe formed almost entirely in space. “On average, these quasars are not necessarily found in the densest regions of the early universe.”Anna-Christina Ellers, Professor of The bodyThe body au Massachusetts Institute of Technology (MIT, United States), in a press release. And then the question arises again: How can we understand that such massive quasars are in the middle of nowhere, when they have nothing nearby to eat?

Quasars in the middle of nowhere

The five quasars the astronomers studied formed just 600 to 700 million years after the Big Bang. Power by Massive black holesMassive black holes A billion times On a large scaleOn a large scale our SoleilSoleil. gave Telescope native James WebbTelescope native James Webb provided more detailed images of these objects and their surroundings than ever before. What astronomers call “Champ du Coeur”.

According to James-Webb observations, the mass of the black hole behind the most distant known quasar is inexplicable.

i The Astrophysical Journalthe researchers report that the quasar fields they observed looked very different from each other. A quasar is surrounded by fifty galaxies. Another one, of only two. However, they are both the same size, the same VolumeVolumethe same shineshine And the same age. ” Really surprised to see this.», commented Anna Cristina Ellers.

To explain this phenomenon, astronomers suggest that these quasars that appear to be traveling in the middle of nowhere are not really so lonely. Their fields may contain galaxies that are surrounded by dense dust that would prevent our instruments from detecting them. Further observations should help see things more clearly.

If the hypothesis is disproved, it may be time to question accepted cosmological models. Those who suggest it increased steadily, along with the rate of the oldest quasarsincreaseincrease Too high because there weren’t enough in the relatively empty regions of space where some of them have evolved. The matterThe matter Measured to reach the masses.“Our results show that an important piece of the puzzle of massive black hole formation is still missing.Note Anna Christina Ellers.If there isn’t enough material around some quasars for them to grow continuously, that means they must have some other way to grow. We don’t know which one. »

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