The galaxy ESO 546G-34 is small faint and unevolved low surface brightness galaxy of dwarf-type, which makes it somewhat similar to the Small Magellanic Cloud (companion galaxy to the Milky Way) in appearance. ESO 546G-34 has an extremely low abundance of heavier elements and contains at least 50 percent gas, which also makes it similar to the small galaxies that were abundant in the early universe. Credit: ESO
A unique example of some of the lowest surface brightness galaxies in the universe have been found by an international team of astronomers lead by the Niels Bohr Institute. The galaxy has lower amounts of heavier elements than other known galaxies of this type. The discovery means that small low surface brightness galaxies may have more in common with the first galaxies formed shortly after the Big Bang than previously thought. The results have been published in Monthly Notices of the Royal Astronomical Society.
Compared to other galaxies of this type the ESO 546G-34 has a very low content of oxygen, nitrogen and an extremely small amounts of heavier elements. It contains at least 50 percent gas, which is several times higher than the corresponding values for a large evolved galaxy like the Milky Way. Also the amount of stars is lower. Credit: Lars Mattsson
'Unevolved' dwarf galaxy
Provided by University of Copenhagen