Physical properties of extreme emission-line galaxies at z∼ 4-9 from the JWST CEERS survey
arxiv(2024)
摘要
Extreme emission line galaxies (EELGs) are typically characterized by high
equivalent widths (EWs) which are driven by elevated specific star formation
rates (sSFR) in low-mass galaxies with subsolar metallicities and little dust.
Such extreme systems are rare in the local universe, but the number density of
EELGs increases with redshift. Such starburst galaxies are currently presumed
to be the main drivers of hydrogen reionization over 5.50.4-1 which indicates that
star formation may be the dominant source of ionization. Based on the
photometric fluxes, we find an increase of EW([OIII]+Hβ) with sSFR and
Σ_SFR, and a decrease with age and stellar mass. The sample of EELGs
can reach Σ_SFR>10Msun yr^-1kpc^-2 which indicate they are
strong candidates of LyC leakers. Another indirect indicator is the high values
of O32>5 that can be reached for some galaxies in the sample.
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