Pictor II ultra-faint dwarf galaxy (IMAGE)

Association of Universities for Research in Astronomy (AURA)

Pictor II ultra-faint dwarf galaxy

Caption

This image shows stars in the ultra-faint dwarf galaxy, Pictor II. Pictor II is a satellite galaxy of the Large Magellanic Cloud, which is a satellite galaxy of the Milky Way, and is located in the constellation Pictor. The system is made up of several thousand stars and is more than ten billion years old.

Within this small, ancient galaxy, astronomers discovered a star, PicII-503, with the lowest iron content ever measured outside of the Milky Way. With less than 1/40,000th the amount of iron as the Sun, PicII-503 is the clearest example of a star within a primordial system that preserves the chemical enrichment of the Universe’s first stars. PicII-503 also has an extreme overabundance of carbon, providing the missing link to connect carbon-enhanced stars observed in the Milky Way halo to an origin in ancient dwarf galaxies.

Credit

CTIO/NOIRLab/DOE/NSF/AURA Image processing: Image Processing: T.A. Rector (University of Alaska Anchorage/NSF NOIRLab), M. Zamani & D. de Martin (NSF NOIRLab) Acknowledgment: PI: Anirudh Chiti, Alex Drlica-Wagner

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