  We investigate the properties of mesons with the exotic J^PC = 1^-+ quantum
numbers. Starting out from the light-quark domain, where the \pi_1 states are
used as references, we predict the masses of analogous quarkonia for c\bar{c}
and b\bar{b} configurations. We employ a covariant
Dyson-Schwinger-Bethe-Salpeter-equation approach with a rainbow-ladder
truncated model of quantum chromodynamics.
