Ionized gas kinematics and chemical abundances of low-mass star-forming galaxies at $z\sim 3$
arxiv（2023）
摘要
We selected 35 low-mass SFGs (7.81000\r{A} and EW(CIII])>5\r{A}, closely resembling those now seen in EoR galaxies with JWST. We find low gas-phase metallicities 12+log(O/H)~7.4-8.5 and C/O abundances from 21%-173% solar, with an apparent increasing trend with metallicity. From our [OIII]4959,5007 profile modeling, we find that 65% of our sample shows an outflow component, which is shifted relative to the ionized gas systemic velocity, with mean $v_{max}$~280 km/s which correlates with the $\Sigma_{SFR}$. We find that the mass-loading factor $\mu$ of our sample is typically lower than in more massive galaxies from literature but higher than in typical local dwarf galaxies. In the stellar mass range covered, we find that $\mu$ increases with $\Sigma_{SFR}$ thus suggesting that for a given stellar mass, denser starbursts in low-mass galaxies produce stronger outflows. Thus, galaxies with higher $\mu$ tend to have lower metallicity, more intense bursts, and higher EW([OIII]5007). Our results complement the picture drawn by similar studies at lower redshift, suggesting that the removal of ionized gas in low-mass SFGs driven by stellar feedback is regulated by their stellar mass and by their $\Sigma_{SFR}$.
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