Metal-free galaxy candidates discovered in CLASH
  The first metals in the universe are expected to form in population III stars
- primordial stars consisting entirely of hydrogen and helium. However, these
stars have so far remained elusive. Simulations indicate that galaxies
consisting exclusively, or almost exclusively, of population III stars may form
at z>6, and such galaxies may provide one of the best probes of the properties
of the population III star formation mode. By fitting Yggdrasil model spectra
to multiband photometry data, we have identified four population III galaxy
candidates in the Cluster Lensing and Supernova survey with Hubble (CLASH). We
rule out alternative mundane galaxies and low redshift interlopers through
similar fits to catalogs of spectra from more mundane objects. If confirmed
through spectroscopy, this would constitute the first detection of the "missing
link" between the early pristine universe and the metal-enriched universe.
