The infall of dwarf satellite galaxies are influenced by their host’s massive accretions

Recent progress in constraining the massive accretions (>1:10) experienced by Milky Way (MW) and Andromeda galaxy (M31) offers an opportunity to understand dwarf population of Local Group. Using zoom-in dark matter-only simulations MW-mass haloes concentrating on subhaloes that are thought be capable hosting galaxies, we demonstrate infall a progenitor is accompanied with accretion destruction large number subhaloes. Massive accreted progenitors do not increase total infalling onto host, but instead focus surrounding host causing clustering time This leads temporary elevation as well changes their cumulative radial profile within virial radius host. Surviving associated have diversity orbits. We find star formation quenching times Group spheroidal galaxies ($10^{5} \mathrm{M_{\odot}} \lesssim \mathrm{M}_{*} 10^{7} \mathrm{M_{\odot}}$) clustered around most suffered MW M31. Our results imply a) spheroidals good proxy b) absence recently quenched satellites M31 suggests M33 its first was much earlier.