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- W4386977265 abstract "We report on a $rm{[CII]}_{158murm{m}}$ search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed {lya} emitting galaxies at $z sim 7$. Our targets are ultra-violet (UV) faint systems with stellar masses on the order of $M_{*} sim 10^{9} M_{odot}$. We detect a single [CII] line emission ($4sigma$) from the brightest ($L sim 2.4 times 10^{10}L_{odot}$) galaxy in our sample, MACS0454-1251. We determine a systemic redshift ($z_{rm{[CII]}} = 6.3151 pm 0.0005$) for MACS0454-1251 and measure a {lya} velocity offset of $Delta v approx 300 pm 70 rm{km,s}^{-1}$. The remaining two galaxies we detect no {ct} but provide $3 sigma$ upper limits on their {ct} line luminosities which we use to investigate the $L_{textrm{[CII]}} - rm{SFR}$ relation. Overall our single {ct} detection shows agreement with the relation for dwarf and local starburst galaxies. Our [CII] deficient galaxies could potentially be exhibiting low metallicities ($Z<Z_{odot}$). Another possible explanation for weaker [CII] 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 $T_{d}=35 rm{K}$ dust masses ($M_{rm{dust}}$) range from $< 4.8 times 10^{7} M_{odot} $ to $2.3 times 10^{8} M_{odot}$. Collectively, our results suggest faint reionization era sources could be metal poor and/or could have strong feedback suppressing [CII] emission." @default.
- W4386977265 created "2023-09-23" @default.
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- W4386977265 date "2023-09-20" @default.
- W4386977265 modified "2023-10-18" @default.
- W4386977265 title "Studying [CII] Emission in Low-mass Galaxies at z ~ 7" @default.
- W4386977265 doi "https://doi.org/10.48550/arxiv.2309.11548" @default.
- W4386977265 hasPublicationYear "2023" @default.
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