Two Lensed Lyman-alpha Emitting Galaxies at z~5
  We present observations of two strongly lensed $z\sim5$ Lyman-$\alpha$
Emitting (LAE) galaxies that were discovered in the Sloan Giant Arcs Survey
(SGAS). We identify the two sources as SGAS J091541+382655, at $z=5.200$, and
SGAS J134331+415455 at $z=4.994$. We measure their AB magnitudes at
$(i,z)=(23.34\pm0.09,23.29\pm0.13$) mags and
$(i,z)=(23.78\pm0.18,24.24^{+0.18}_{-0.16}$) mags, and the rest-frame
equivalent widths of the Lyman-$\alpha$ emission at $25.3\pm4.1$\AA~and
$135.6\pm20.3$\AA~for SGAS J091541+382655 and SGAS J134331+415455,
respectively. Each source is strongly lensed by a massive galaxy cluster in the
foreground, and the magnifications due to gravitational lensing are recovered
from strong lens modeling of the foreground lensing potentials. We use the
magnification to calculate the intrinsic, unlensed Lyman-$\alpha$ and UV
continuum luminosities for both sources, as well as the implied star formation
rates (SFR). We find SGAS J091541+382655 and SGAS J134341+415455 to be galaxies
with (L$_{Ly-\alpha}$, L$_{UV})\leq(0.6$L$_{Ly-\alpha}^{*}, 2$L$_{UV}^{*}$) and
(L$_{Ly-\alpha}$, L$_{UV})=(0.5$L$_{Ly-\alpha}^{*}, 0.9$L$_{UV}^{*}$),
respectively. Comparison of the spectral energy distributions (SEDs) of both
sources against stellar population models produces estimates of the mass in
young stars in each galaxy: we report an upper limit of M$_{stars} \leq
7.9^{+3.7}_{-2.5} \times 10^{7}$ M$_{\sun} h_{0.7}^{-1}$ for SGAS
J091531+382655, and a range of viable masses for SGAS J134331+415455 of
$2\times10^{8}$ M$_{\sun} h_{0.7}^{-1} <$ M$_{stars} < 6\times10^{9}$ M$_{\sun}
h_{0.7}^{-1}$.
