  We give a condition on the defining graph of a right-angled Artin group which
implies its automorphism group is virtually indicable, that is, it has a
finite-index subgroup that admits a homomorphism onto $\Z$.
  We use this as part of a criterion that determines precisely when the outer
automorphism group of a right-angled Artin group defined on a graph with no
separating intersection of links has property (T). As a consequence we also
obtain a similar criterion for graphs in which each equivalence class under the
domination relation of Servatius generates an abelian group.
