20.500.12556/RUL-160387 Studying [C II] emission in low-mass galaxies at z ~ 7 We report on a [CII]$_{158\mu\mathrm{m}}$ search using the Atacama Large Millimeter/submillimeter Array (ALMA) on three lensed, confirmed Ly$\alpha$ emitting galaxies at z ∼ 7. Our targets are ultraviolet (UV) faint systems with stellar masses on the order of M$_*$ ∼ $10^9\ \mathrm{M}_{\odot}$. We detect a single [C II] line emission (4$\sigma$) from the brightest (L ∼ 2.4 × $10^{10}\ \mathrm{L}_\odot$) 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$\alpha$ velocity offset of $\Delta v \approx 300 \pm 70\mathrm{km\ s^{-1}}$⁠. The remaining two galaxies we detect no [C II] but provide 3$\sigma$ upper limits on their [C II] line luminosities which we use to investigate the $L_{[C II]}-\mathrm{SFR}$ 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$_{\odot}$). 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 $T_d=35\mathrm{K}$ dust masses ($\mathrm{M_{dust}}$) range from < 4.8 × $10^7\ \mathrm{M}_\odot$ to 2.3 × $10^8\ \mathrm{M}_\odot$. Collectively, our results suggest faint reionization era sources could be metal poor and/or could have strong feedback suppressing [C II] emission. high-redshift galaxies gravitational lensing galaksije z velikim rdečim premikom gravitacijsko lečenje true false true Angleški jezik Slovenski jezik Članek v reviji 2024-08-27 15:53:55 2024-08-27 15:53:56 2025-12-11 09:18:15 0000-00-00 00:00:00 2024 0 0 Str. 945-952 iss. 1 Vol. 531 Jun. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 524.8 1365-2966 10.1093/mnras/stae1178 205494275 stae1178.pdf stae1178.pdf 1 FDE1C07E71BF11F23DCE0C2BE0BDF88F 93a624d4ebcbb508ed5664a658a84d5bb8d9abb8067475c833090684706784fb f28ed3c6-647b-11ef-8f74-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189057 https://academic.oup.com/mnras/article/531/1/945/7666766 0 982cc01f-647b-11ef-8f74-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=189056 Fakulteta za matematiko in fiziko 0 0 0