  Unusually high velocities (< ~0.1c) and correspondingly high kinetic energies
have been observed in a subset of Type Ic supernovae (so-called "broad-lined
Ic" supernovae; SNe Ic-BL), prompting a search for a central engine model
capable of generating such energetic explosions. A clue to the explosion
mechanism may lie in the fact that all supernovae that accompany long-duration
gamma-ray bursts belong to the SN Ic-BL class. Using a combination of
two-dimensional relativistic hydrodynamics and radiation transport
calculations, we demonstrate that the central engine responsible for long
gamma-ray bursts can also trigger a SN Ic-BL. We find that a reasonable
gamma-ray burst engine injected into a stripped Wolf-Rayet progenitor produces
a relativistic jet with energy ~10^51 ergs, as well as a SN whose synthetic
light curves and spectra are fully consistent with observed SNe Ic-BL during
the photospheric phase. As a result of the jet's asymmetric energy injection,
the SN spectra and light curves depend on viewing angle. The impact of viewing
angle on the spectrum is particularly pronounced at early times, while the
viewing angle dependence for the light curves (~10% variation in bolometric
luminosity) persists throughout the photospheric phase.
