How low does it go? Too few Galactic satellites with standard reionization quenching

  title={How low does it go? Too few Galactic satellites with standard reionization quenching},
  author={Andrew S. Graus and James S Bullock and Tyler Kelley and Michael Boylan-Kolchin and Shea Garrison-Kimmel and Yuewen Qi},
  journal={Monthly Notices of the Royal Astronomical Society},
A standard prediction of galaxy formation theory is that the ionizing background suppresses galaxy formation in haloes with peak circular velocities smaller than $V_{\rm peak}\simeq 20 \, \rm km \, s^{-1}$, rendering the majority of haloes below this scale completely dark. We use a suite of cosmological zoom simulations of Milky Way-like haloes that include central Milky Way disc galaxy potentials to investigate the relationship between subhaloes and ultrafaint galaxies. We find that there… 

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    Monthly Notices of the Royal Astronomical Society
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