A HERO’S DARK HORSE: DISCOVERY OF AN ULTRA-FAINT MILKY WAY SATELLITE IN PEGASUS

@article{Kim2015AHD,
  title={A HERO’S DARK HORSE: DISCOVERY OF AN ULTRA-FAINT MILKY WAY SATELLITE IN PEGASUS},
  author={Dongwon Kim and Helmut Jerjen and Dougal Mackey and Gary S. Da Costa and Antonino P. Milone},
  journal={The Astrophysical Journal},
  year={2015},
  volume={804}
}
We report the discovery of an ultra-faint Milky Way satellite galaxy in the constellation of Pegasus. The concentration of stars was detected by applying our overdensity detection algorithm to the SDSS-DR 10 and confirmed with deeper photometry from the Dark Energy Camera at the 4 m Blanco telescope. Fitting model isochrones indicates that this object, Pegasus III, features an old and metal-poor stellar population ([Fe/H] ∼ –2.1) at a heliocentric distance of 205 ± 20 kpc. The new stellar… 

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