protogroups

English

Noun

protogroups

1. plural of protogroup
   • 2015, P. Medvedev, S. Sazonov, M. Gilfanov, “Helium diffusion during formation of the first galaxies”, in arXiv‎^[1]:

     Even stronger abundance enhancements, $\delta Y_{p}/Y_{p}$ ~ a few $10^{-3}$, may arise at much later, post-reionization epochs, z ~ 2, in protogroups of galaxies ($\sim 10^{13}M_{\odot }$) as a result of accretion of warm-hot intergalactic medium with T ~ 10^6 K.