The most distant galaxy found: it has the largest black hole or super-old stars

Called HD1, the galaxy lies about 13.5 billion light-years away. So far, scientists are only building

assumptions about what it is.

The team came up with two ideas:

  • HD1 could have formed from a very fast star, and it is possible that there are other type III stars in this galaxy - these are the very first stars in the Universe that have not yet been observed.
  • HD1 may contain a supermassive black hole with a mass about 100 million times that of the Sun.

Galaxy HD1 is very bright in the ultravioletlight. To explain this, the authors of the work stated that it is possible that some kind of energy processes are taking place in it or that it happened several billion years ago. The researchers were also surprised by how many stars HD1 produces: according to preliminary estimates, it forms more than 100 stars every year. This is about 10 times more than scientists expected.

Therefore, two theories appeared at once that can explain the bright ultraviolet glow.

The first stars in the universe were more massive,brighter and hotter than modern ones. If we assume that the stars that formed in HD1 are the very first stars or type III stars, then all the features of the galaxy can be easily explained. We know that Type III stars emit more ultraviolet light than ordinary stars.

Fabio Pacucci, lead author of the MNRAS study

But also supermassive black can affect the brightness of the HD1 galaxy. Since it absorbs a huge amount of gas and emits high-energy photons.

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