A galaxy having a very small size
(< 1 kpc), very low stellar mass
(typically 106.5 to 107.5
Msun),
very low gas → metallicity
(3 to 10% solar
→ metallicity,
and very high → ionization.
Blueberry galaxies, compared to star forming
→ <i><a class="linkVoir" href="/terms/dwarf-galax/">dwarf galax</a></i>ies,
have similar stellar mass and luminosity,
but much stronger → <i><a class="linkVoir" href="/terms/o-iii-doublet/">[O III] doublet</a></i>
(λλ4959+5007) line
strength and gas ionization. Because Blueberry galaxies
are selected by the strong [O III] → <i><a class="linkVoir" href="/terms/emission-line/">emission line</a></i>s,
they represent
the star-forming → <i><a class="linkVoir" href="/terms/dwarf-galax/">dwarf galax</a></i>ies
with the highest
emission line strength and gas ionization.
On the other hand, compared to → <i><a class="linkVoir" href="/terms/green-pea-galax/">Green Pea galax</a></i>ies
at → <i><a class="linkVoir" href="/terms/redshift/">redshift</a></i>s
<i>z</i> ~ 0.2-0.3 and typical high-<i>z</i>→ <i><a class="linkVoir" href="/terms/lyman-alpha-emitting/">Lyman alpha emitting</a></i> galaxies (LAEs)
found in the current
narrow-band surveys, Blueberry galaxies have similarly
strong emission lines but about 10-100 times smaller
stellar mass, → star formation rate,
and luminosity. So Blueberry galaxies
represent the faint-end of → Green Pea galaxies
and → Lyman alpha emitting galaxies
(Yang et al, 2017, arxiv/1706.02819, and references
therein).
See also: → blueberry; → galaxy.
