A preprint of “Direct evidence of hierarchical assembly at low masses from isolated dwarf galaxy groups” (Stierwalt et al.) is now available on the arXiv. In this paper we use Hα imaging taken with the Magellan Telescope to identify groups of dwarf galaxies (3–5 members), which are confirmed with spectroscopic follow-up. These rare groups may be interesting low-redshift analogies for the progenitors of isolated, more massive galaxies.
Update (23 January): This article is now published in Nature Astronomy.