HALO VELOCITY GROUPS IN THE PISCES OVERDENSITY

@article{Sesar2010HALOVG,
  title={HALO VELOCITY GROUPS IN THE PISCES OVERDENSITY},
  author={Branimir Sesar and Anna Katherina Vivas and Sonia Duffau and Željko Ivezi{\'c}},
  journal={The Astrophysical Journal},
  year={2010},
  volume={717},
  pages={133-139}
}
We report spectroscopic observations of five faint (V ~ 20) RR Lyrae stars associated with the Pisces overdensity conducted with the Gemini South Telescope. At a heliocentric and galactocentric distance of ~80 kpc, this is the most distant substructure in the Galactic halo known to date. We combined our observations with literature data and confirmed that the substructure is composed of two different kinematic groups. The main group contains eight stars and has V gsr = 50 km s–1, while the… 

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