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Fig. 1.


Predicted velocity dispersions including the EFE (blue lines) and for the isolated case (dotted lines) as function of the three dimensional separation up to 1 Mpc. The inclusion of the EFE is stopped when g/gex >  2. The vertical dotted line corresponds to the on-sky separation (and thereby lower limit of the 3D distance) between the host and the UDG. The upper and lower limits of the curves are derived by varying the M/L and the distance to the host, see text. The last two entries – M 96-DF6 and Cen A-MM-Dw1 – have high-precision distance measurements available, we therefore indicate the three dimensional separation (gray line) as well as the associated 1σ uncertainties (gray area).

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