Thursday , May 13 2021

Billions of dwarf galaxies could be captured in the first photos of the “space grid”

According to Astronomy & Astrophysics, a small area of ​​the sky was observed for 140 hours with a very large telescope (VLT) and its MUSE (Multi-Unit Spectroscopic Explorer) instrument. The farthest observed threads had already formed when the universe was 1.3 billion. years. The closest: about 800 million. years later. This was a particularly important time for the universe, when stars formed rapidly and galaxies grew.

The space observed in this ambitious study is already well known. It’s part of Hubble’s ultra-deep field. This area has been monitored by the Hubble Space Telescope since 2003. Late 2004 early. The image of the telescope has been constantly improved and remains the deepest to date i have never taken a picture of the universe. New observations may further expand it.

According to estimates by previous astronomers, about 10,000 galaxies can be seen in this area of ​​the sky. That number is expected to grow. In the ultra-deep field locations studied by the team, this figure is 40 percent. higher. And that’s not all. There are likely to be many more galaxies we can’t see.

To understand what illuminates these threads from cosmic gas-based networks, the researchers used the simulation. The gases in these interstellar connections are widely dispersed, which means that if we look at them, they are illuminated by something. The simulation helped answer the team’s questions. There are countless galaxies in the universe and researchers believe that these threads are illuminated by billions of dwarf galaxies that are too small and faint to be seen.

“We believe that our visible light comes mainly from young galaxies, each with millions of stars less than our Bird Bird. “Such small galaxies probably marked the end of the cosmic‘ dark era ’, when, less than a billion years after the Big Bang, the universe was finally illuminated and warmed by the first generation of stars. said Joop Schaye, co-author of the study at the Leiden Observatory.

This discovery will no doubt start a huge debate. According to the most popular hypothesis, gas chains glow due to a cosmic ultraviolet background created by young stars in galaxies. In this context, the gas heats up and begins to glow. But much more observation will be needed before discovering the secrets of the space network.

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