Studying [C ii] emission in low-mass galaxies at z ∼ 7

We report on a [CII]158μ m search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed Ly α emitting galaxies at z ∼ 7. Our targets are ultraviolet (UV) faint systems with stellar masses on the order of M* ∼ 109 M⊙. We detect a single [C ii] line emission (4σ) from the brightest (L ∼ 2.4 × 1010L⊙) galaxy in our sample, MACS0454-1251. We determine a systemic redshift (z[C ii] = 6.3151 ± 0.0005) for MACS0454-1251 and measure a Ly α velocity offset of Δ v ≈ 300 ± 70 km\, s⁻¹. The remaining two galaxies we detect no [C ii] but provide 3σ upper limits on their [C ii] line luminosities which we use to investigate the L[CII] - SFR relation. Overall our single [C ii] detection shows agreement with the relation for local dwarf galaxies. Our [C ii] deficient galaxies could potentially be exhibiting low metallicities (Z < Z⊙). Another possible explanation for weaker [C ii] emission could be strong feedback from star formation disrupting molecular clouds. We do not detect continuum emission in any of the sources, placing upper limits on their dust masses. Assuming a single dust temperature of Td=35 K dust masses (Mdust) range from <4.8 × 107 M⊙ to 2.3 × 108 M⊙. Collectively, our results suggest faint reionization era sources could be metal poor and/or could have strong feedback suppressing [C ii] emission.