We conduct the first self-consistent numerical simulations of a recently discovered population of 47 large , faint ( ultra-diffuse ) galaxies , speculated to lie in the Coma cluster .
With structural properties consistent with very large low surface brightness systems ( i.e . \mu ( g,0 ) < 24 mag arcsec ^ { -2 } ; r _ { e } comparable to the Galaxy ) , the red colour ( \langle g-r \rangle \sim 0.8 ) and assumed low metallicity of these objects compels us to consider a scenario in which these are underdeveloped galaxies whose early ( z \simeq 2 ) accretion to an overdense environment quenched further growth .
Our simulations demonstrate the efficacy of this scenario , with respect to available observational constraints , using progenitor galaxy models derived from scaling relations , and idealised tidal/hydrodynamical models of the Coma cluster .
The apparent ubiquity of these objects in Coma implies they constitute an important galaxy population ; we accordingly discuss their properties with respect to a \Lambda CDM cosmology , classical LSBs , and the role of baryonic physics in their early formation .