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According to LCDM theory, hierarchical evolution occurs on all mass scales,implying that satellites of the Milky Way should also have companions. Therecent discovery of ultra-faint dwarf galaxy candidates in close proximity tothe Magellanic Clouds provides an opportunity to test this theory. We presentproper motion (PM) measurements for 13 of the 32 new dwarf galaxy candidatesusing Gaia data release 2. All 13 also have radial velocity measurements. Wecompare the measured 3D velocities of these dwarfs to those expected at thecorresponding distance and location for the debris of an LMC analog in acosmological numerical simulation. We conclude that 4 of these galaxies (Hor1,Car2, Car3 and Hyi1) have come in with the Magellanic Clouds, constituting thefirst confirmation of the type of satellite infall predicted by LCDM. Ret2,Tuc2 and Gru1 have velocity components that are not consistent within 3 sigmaof our predictions and are therefore less favorable. Hya2 and Dra2 could beassociated with the LMC and merit further attention. We rule out Tuc3, Cra2,Tri2 and Aqu2 as potential members. Of the dwarfs without measured PMs, 5 ofthem are deemed unlikely on the basis of their positions and distances alone asbeing too far from the orbital plane expected for LMC debris (Eri2, Ind2, Cet2,Cet3 and Vir1). For the remaining sample, we use the simulation to predict PMsand radial velocities, finding that Phx2 has an overdensity of stars in DR2consistent with this PM prediction.

The Missing Satellites of the Magellanic Clouds? Gaia Proper Motions of the Recently Discovered Ultra-Faint Galaxies