Tuesday , November 30 2021

Billions of dwarf galaxies can be captured in the first photographs of the “space grid”.


According to Astronomy & Astrophysics, a small area of ​​the sky was observed for 140 hours using the Very Large Telescope (VLT) and MUSE (Multi-Unit Spectroscopic Explorer) device. The furthest observed threads had already formed when the universe was 1.3 billion. year. The closest – about 800 million. after the years. This was a particularly important time for the universe where stars were forming rapidly and galaxies were growing.

The area 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. Starting end of 2004. The telescope image has been continuously improved and remains in its deepest form to date I’ve ever taken a picture of the universe. New observations could expand it further.

According to previous astronomer estimates, about 10,000 galaxies can be seen in this region of the sky. This number is expected to increase. This number is approximately 40 percent in ultra-deep field locations the team has examined. higher. And that’s not all. There are likely to be many more galaxies outside that we cannot see.

To understand what illuminates these gas-based cosmic web strings, the researchers used simulation. The gases in these interstellar connections are widely distributed, so if we see them, they are illuminated by something. The simulation helped answer the team’s questions. There are countless galaxies in the universe, and researchers believe these threads are illuminated by billions of dwarf galaxies that are too small and dim to be seen.

“We think that our visible light comes mostly from young galaxies, each with millions of times less stars than our Bird Reception. Co-author Joop Schaye said, “Such small galaxies probably marked the end of the cosmic ‘dark age’, less than a billion years after the Big Bang, when the universe was finally illuminated and heated by the first generation of stars.

This discovery will undoubtedly spark a great debate. According to the most popular hypothesis, gas cords glow due to the cosmic ultraviolet background created by young stars in galaxies. Against this background, the gas heats up and begins to glow. However, before we can unravel the secrets of the space web, we will have to do more and more observations.

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