Meanings
noun
- pluralplural of protogroup
Even stronger abundance enhancements, #92;deltaY#95;p#47;Y#95;p ~ a few 10#123;-3#125;, may arise at much later, post-reionization epochs, z ~ 2, in protogroups of galaxies (#92;sim 10#123;13#125;M#95;#123;#92;odot#125;) as a result of accretion of warm-hot intergalactic medium with T ~ 10^6 K.
2015, P. Medvedev, S. Sazonov, M. Gilfanov, “Helium diffusion during formation of the first galaxies”, in arXiv
Cite this entry
APA
protogroups. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/protogroups
MLA
“protogroups.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/protogroups. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “protogroups,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/protogroups.
Source: protogroups on Wiktionary, CC BY-SA 4.0.