Measuring Star Formation Histories, Distances, and Metallicities with
  Pixel Color-Magnitude Diagrams II: Applications to Nearby Elliptical Galaxies
  We present spatially-resolved measurements of star formation histories
(SFHs), metallicities, and distances in three nearby elliptical galaxies and
the bulge of M31 derived using the pixel color-magnitude diagram (pCMD)
technique. We compute pCMDs from archival $\textit{HST}$ photometry of M87,
M49, NGC 3377 and M31, and fit the data using the new code $\texttt{PCMDPy}$.
We measure distances to each system that are accurate to $\sim 10\%$. The
recovered non-parametric SFHs place reasonable ($\pm 1$ dex) constraints on the
recent (< 2 Gyr) star formation in M31 and NGC 3377, both of which show
evidence of inside-out growth. The SFHs in M87 and M49 are constrained only at
the oldest ages. The pCMD technique is a promising new avenue for studying the
evolutionary history of the nearby universe, and is highly complementary to
existing stellar population modeling techniques.
