A galaxy that has just emerged from hiding may be one of the youngest galaxies ever discovered, offering a potential portal to the secrets of the early universe. Dubbed Peekaboo, the galaxy has moved from behind a bright star (from our perspective) within the last 50 to 100 years. But it’s not just the galaxy’s relatively recent appearance that’s exciting astronomers.In the results published in Monthly Notices of the Royal Astronomical Society, scientists report that Peekaboo appears to be significantly deficient in old stars. New measurements suggest that dwarf galaxies may have formed billions of years after the Big Bang.
Gagandeep Anand, an astronomer at the Space Telescope Science Institute and co-author of the new study, said: As stars age, they produce heavier elements, including metals. Peek-A-Boo is one of three relatively nearby galaxies, 22 million light-years away and much closer, that astronomers have found to be extremely metal-lacking, requiring further study. It is suitable.
Astronomers first discovered a hint of the Peekaboo Galaxy during an all-sky survey in 2001, but the glare of a closer star has largely obscured it from additional scrutiny. A high-quality image of him taken by the Hubble Space Telescope in 2020 confirmed that the partially obscured object was a dwarf galaxy, and subsequent optical observations revealed a lack of elements heavier than hydrogen and helium. It became clear that there is universe.
Researchers don’t yet know if Peekaboo’s metal-deficient state is a telltale sign of its age. ‘ said. Another possibility she suggests is that Peekaboo, a dwarf galaxy, has relatively weak gravity and heavy metals may have been blown away by the galactic wind.
Current measurements don’t suggest there are any stars older than 2 or 3 billion years in the galaxy, but Anand says that follow-up observations, possibly using the super-powerful James Webb Space Telescope, suggest the researchers points out that we can look for stars that are fainter than older stars. As 13 billion years. If such a star were found, Peekaboo’s youth would be questioned.
But if the Peekaboo galaxy is as young as researchers think, it will be one of the best laboratories available to study how the universe approached the Big Bang. , McQuinn says, could help us better understand the physics of gas cooling and star formation in environments like the early universe.
