  We analyze the recent data from the BRAHMS Collaboration on the
pseudorapidity dependence of nuclear modification factors in Au+Au collisions
at $\sqrt{s_{NN}}$ = 200 GeV by using the full three dimensional hydrodynamic
simulations for the density effects on parton energy loss. We first compute the
transverse spectra at $\eta=0$ and 2.2, and next take a ratio
$R_{\eta}=R_{AA}(\eta=2.2)/R_{AA}(\eta=0)$, where $R_{AA}$ is a nuclear
modification factor. It is shown that hydrodynamic components account for
$R_{\eta}\simeq 1$ at low $p_\mathrm{T}$ and that quenched pQCD components lead
$R_{\eta} < 1$ at high $p_\mathrm{T}$ which are consistent with the data.
Strong suppression at $\eta=2.2$ is compatible with the parton energy loss in
the final state.
