Subgroup conjugacy separability in residually free groups

In this paper, we prove that finitely presented residually free groups are subgroup conjugacy separable. Furthermore, if they are of type [Formula: see text], then they are also subgroup conjugacy distinguished. By using a connection between conjugacy separability and residual finiteness of outer automorphism group established by Grossman in [11], we show that finitely presented residually free groups have residually finite outer automorphism groups.