  We use the radial baryon acoustic oscillation (BAO) measurements of Gaztanaga
et al. (2008) to constrain parameters of dark energy models. These constraints
are comparable with constraints from other "non-radial" BAO data. The radial
BAO data are consistent with the time-independent cosmological constant model
but do not rule out time-varying dark energy. When we combine radial BAO and
the Kowalski et al. (2008) Union type Ia supernova data we get very tight
constraints on dark energy.
