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Post Info TOPIC: ESO 546-G34
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RE: ESO 546-G34
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New Insights Into The 'Hidden' Galaxies Of The Universe

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.
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.
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Blobrana


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Title: ESO 546-G34: The most metal poor LSB galaxy?
Authors: Lars Mattsson, Leonid S. Pilyugin, Nils Bergvall

We present a re-analysis of spectroscopic data for 23 HII-regions in 12 blue, metal-poor low surface brightness galaxies (LSBGs) taking advantage of recent developments in calibrating strong-line methods. In doing so we have identified a galaxy (ESO 546-G34) which may be the most metal-poor LSB galaxy found in the local Universe. Furthermore, we see evidence that blue metal-poor LSBGs, together with blue compact galaxies (BCGs) and many other HII galaxies, fall outside the regular luminosity-metallicity relation. This suggests there might be an evolutionary connection between LSBGs and BCGs. In such case, several very metal-poor LSBGs should exist in the local Universe.

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