  Measurements of the total and differential cross sections of Higgs boson
production are performed using 20.3 fb$^{-1}$ of $pp$ collisions produced by
the Large Hadron Collider at a center-of-mass energy of $\sqrt{s} = 8$ TeV and
recorded by the ATLAS detector. Cross sections are obtained from measured $H
\rightarrow \gamma \gamma$ and $H \rightarrow ZZ ^{*}\rightarrow 4\ell$ event
yields, which are combined accounting for detector efficiencies, fiducial
acceptances and branching fractions. Differential cross sections are reported
as a function of Higgs boson transverse momentum, Higgs boson rapidity, number
of jets in the event, and transverse momentum of the leading jet. The total
production cross section is determined to be $\sigma_{pp \to H} = 33.0 \pm 5.3
\, ({\rm stat}) \pm 1.6 \, ({\rm sys}) \mathrm{pb}$. The measurements are
compared to state-of-the-art predictions.
