A black hole that broke galactic rules

According to RCO News Agency, When astronomers look deep into the early universe, they don’t expect to encounter fully formed cosmic objects, but usually look for small galaxies, young stars, and still-growing black holes.

However, recent observations with the James Webb Space Telescope have revealed something completely unexpected: a supermassive black hole that exists almost alone, with only a handful of stars visible around it.

This mass was observed in a galaxy called Abell 2744-QSO1. This galaxy existed only about 700 million years after the Big Bang, and its central black hole had a mass of about 50 million times the mass of the Sun at the same time.

The existence of such mass challenges fundamental notions about how black holes are born and raises the intriguing possibility that some black holes may have formed even before stars formed.

Cosmic crime that breaks the rules

In standard astrophysics, black holes and stars are closely related. Stars form from the collapse of gas clouds, and only much later, when the most massive stars run out of fuel, do black holes emerge.

Over time, these black holes grow by swallowing gas and merging with other black holes. This process takes time, and for this reason, astronomers find it difficult to explain the appearance of supermassive black holes at the beginning of the universe’s history.

The host galaxy, QSO1, makes this problem even more complicated. This galaxy has very little stellar mass, meaning that its number of stars is not enough to explain the existence of such a massive black hole.

According to the study’s authors, this situation creates a fundamental paradox: the black hole appears to have grown to a very large mass without first forming a normal galaxy around it.

To investigate this puzzle, researchers turned to an idea that was proposed decades ago, but never confirmed: primordial black holes. These hypothetical objects were proposed by Stephen Hawking and Bernard Carr in the 1970s.

Unlike black holes that form from the death of stars, primordial black holes could have formed directly from the intense density fluctuations in the universe shortly after the Big Bang. Most of these black holes, if formed, must have been very small and short-lived.

However, the researchers investigated whether a small number of them were able to survive under the right conditions and then grow rapidly. They built new, more advanced simulations that tracked the behavior of the gas around a primordial black hole, the subsequent formation of nearby stars, and the feeding of the black hole by material from the deaths of stars.

In these simulations, the researchers started with a very massive primordial black hole “seed,” about 50 million times the mass of the Sun, and then investigated how gas flows into it, how stars form around it, and how stellar explosions feed material back into the growing black hole.

Unlike previous simpler models, these simulations considered several intertwined processes simultaneously. When the research team compared the results with James Webb’s actual data, a close match was observed; Not only in terms of the final mass of the black hole, but also in terms of the small number of stars and chemical elements detected around it.

These findings do not prove that the QSO1 black hole must have been a primordial black hole, but they do show that such an origin is consistent with observations. According to the researchers, this is promising because standard models have serious problems in explaining this crime.

Next, they plan to make their simulations more precise and compare the results with future discoveries by James Sobb. If more galaxies like QSO1 are found, they may provide important evidence that some of the world’s largest black holes were not the end product of stellar deaths, but were born from the earliest moments of the universe.

However, challenges remain. For example, typical simulations of primordial black holes rarely produce objects larger than a million times the mass of the Sun.

This means that under common assumptions, primordial black holes could hardly have grown fast enough to account for such extreme mass.

One possible way to solve this problem is that the primordial black holes may have formed in dense clusters in the early universe and could have merged with each other and gained mass much faster, but this process remains uncertain and difficult to model.

Another unresolved issue is that the formation of primordial black holes may require intense bursts of energetic radiation, but so far no such source has been detected near the QSO1 galaxy.

end of message