Astronomers have discovered a nearby galaxy that is similar to galaxies in the distant, early universe by looking past the bright light of a foreground star. This is the most extraordinary example of this type of galaxy found to date. Dubbed 'Peekaboo,' the tiny HIPASS J1131–31 galaxy has only be
Tiny galaxy HIPASS J1131–31 peeks out from behind the glare of star TYC 7215-199-1, a Milky Way star positioned between Hubble and the galaxy. One hundred years ago, this fast-moving foreground star would have appeared directly in the line of sight, and the “Peekaboo” galaxy would not have been detectable at all.
The discovery is a combined effort of telescopes on the ground and in space, including confirmation by. Together the research shows tantalizing evidence that the Peekaboo Galaxy is the nearest example of the galaxy formation processes that commonly took place not long after the big bang, 13.8 billion years ago.
While the universe’s earliest galaxies were XMP by default, similarly metal-poor galaxies have also been found in the local universe. Peekaboo caught astronomers’ attention because, not only is it an XMP galaxy without a substantial older stellar population, but at only 20 million light-years from Earth it is located at least half the distance of the previously known young XMP galaxies.
NASA’s Hubble Space Telescope was able to resolve about 60 stars in the tiny galaxy, almost all of which appear to be a few billion years old or younger. Measurements of Peekaboo’s metallicity by SALT completed the picture. Together, these findings underline the major difference between Peekaboo and other galaxies in the local universe, which typically have ancient stars that are many billions of years old.
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