An international team of astronomers has discovered a dwarf galaxy at the edge of the Andromeda galaxy. It is more than 2.5 million years from Earth.
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The unusually dim dwarf galaxy has been named Pegasus V. Interestingly, Pegasus V was discovered by amateur astronomer Giuseppe Donatiello while studying DESI imagery. Legacy Image Survey. The image was captured with the Dark Energy Camera on the 4-meter Víctor M. Blanco telescope at the Cerro Tololo Inter-American Observatory (CTIO).
Giuseppe discovered a hazy smudge that was later confirmed to be an ultra-dim galaxy. To confirm the stain, astronomers made observations with the 8.1-meter Gemini North telescope in Hawaii.
Observations with the Gemini Telescope show that Pegasus V’s heavy elements are less abundant than similar dwarf galaxies. Therefore, astronomers suspect that Pegasus V is very old, it could even be that this galaxy is the first fossil galaxy in the Universe.
Very faint galaxies are usually fossils of ancient galaxies. This is because very faint galaxies usually carry clues from the formation of the first generation of stars in the Universe. From theory, there should be many fossil galaxies. However, until now, not as many fossil galaxies have been found. If it turns out that there aren’t many fossil galaxies in the universe, then astronomers will have to re-examine cosmology and dark matter.
However, it is not easy to find fossil galaxies. These ancient galaxies were so dim that they were not easy to see. There are not many bright stars in these galaxies that can be used to identify these galaxies as well as to measure their distance. The discovery of fossil galaxies can help astronomers understand how galaxies form as well as about the existence of dark matter.
Cool Facts:
Named Pegasus V because this galaxy is the 5th dwarf galaxy found in the constellation Pegasus.
Source: This article is a republished version of Space Scoop Universe Awareness Indonesian edition. Indonesian edition of Space Scoop translated by heaven.
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