'What sets the sizes of the faintest galaxies?'
Crystal Brasseur, Hans-Walter Rix, Nicolas Martin and Andreas Maccio.


Abstract
We re-investigate the claim that Andromeda dSphs are significantly larger than their 
Milky Way counterparts of the same luminosity (McConnachie et al. 2004).  Performing 
the first statistical comparison, accounting for observational limitations, we find no 
statistically significant size difference between the two populations of satellites.  
Remarkably, our derived mean sizes, slope and scatter found for dSphs matches on to 
the Shen et al, (2003) relation for brighter late-type galaxies. Our results strongly 
suggest that angular momentum arguments and the cosmological framework play a 
role in setting the sizes.