  We present a gravitational lensing model of MACS J1149.5+2223 using
ultra-deep Hubble Frontier Fields imaging data and spectroscopic redshifts from
HST grism and VLT/MUSE spectroscopic data. We create total mass maps using 38
multiple images (13 sources) and 608 weak lensing galaxies, as well as 100
multiple images of 31 star-forming regions in the galaxy that hosts Supernova
Refsdal. We find good agreement with a range of recent models within the HST
field of view. We present a map of the ratio of projected stellar mass to total
mass ($f_{\star}$), and find that the stellar mass fraction for this cluster
peaks on the primary BCG. Averaging within a radius of 0.3 Mpc, we obtain a
value of $\langle f_{\star} \rangle = 0.012^{+0.004}_{-0.003}$, consistent with
other recent results for this ratio in cluster environments, though with a
large global error (up to $\delta f_{\star} = 0.005$) primarily due to the
choice of an IMF. We compare values of $f_{\star}$ and measures of star
formation efficiency for this cluster to other Hubble Frontier Fields clusters
studied in the literature, finding that MACS1149 has a higher stellar mass
fraction than these other clusters, but a star formation efficiency typical of
massive clusters.

Astrophysics of Galaxies;Cosmology and Nongalactic Astrophysics