Reconstructing star formation histories of recently formed ultra-diffuse
  galaxies
  Observational studies of ultra-diffuse galaxies (UDGs) represent a
significant challenge because of their very low surface brightnesses. A
feasible approach is to identify "future" UDGs when their stars are still
young. Using data mining, we found 12 such low-mass spatially extended
quiescent galaxies in the Coma and Abell 2147 clusters in the SDSS legacy
galaxy sample and followed them up using a new high-throughput Binospec
spectrograph at the 6.5m MMT. Several of them exhibit signs of the recently
finished ram pressure stripping. Here we describe our data analysis approach
that uses spectroscopic and photometric measurements with a dedicated set of
stellar population models, which include realistic chemical enrichment and star
formation histories. From our analysis we can precisely estimate stellar
mass-to-light ratios and dark matter content of UDGs.
