Segue 2: The Least Massive Galaxy

@article{Kirby2013Segue2T,
  title={Segue 2: The Least Massive Galaxy},
  author={E. Kirby and M. Boylan-Kolchin and Judith G. Cohen and M. Geha and J. Bullock and Manoj Kaplinghat UC Irvine and Caltech and Yale},
  journal={The Astrophysical Journal},
  year={2013},
  volume={770},
  pages={16}
}
Segue 2, discovered by Belokurov et al., is a galaxy with a luminosity of only 900 L_☉. We present Keck/DEIMOS spectroscopy of 25 members of Segue 2—a threefold increase in spectroscopic sample size. The velocity dispersion is too small to be measured with our data. The upper limit with 90% (95%) confidence is σ_v < 2.2 (2.6) km s^(–1), the most stringent limit for any galaxy. The corresponding limit on the mass within the three-dimensional half-light radius (46 pc) is M_(1/2) < 1.5 (2.1) × 10… Expand
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