Starbursting [O III] emitters and quiescent [C II] emitters in the reionization era release_2upr5u2sr5bnbgmcade7zhrque

by Shohei Arata, Hidenobu Yajima, Kentaro Nagamine, Makito Abe, Sadegh Khochfar

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2020  

Abstract

Recent observations have successfully detected [O III] 88.3 μ m and [C II] 157.6 μ m lines from galaxies in the early Universe with the Atacama Large Millimeter Array (ALMA). Combining cosmological hydrodynamic simulations and radiative transfer calculations, we present relations between the metal line emission and galaxy evolution at z=6-15. We find that galaxies during their starburst phases have high [O III] luminosity of ∼ 10^42  erg s^-1. Once supernova feedback quenches star formation, [O III] luminosities rapidly decrease and continue to be zero for ∼ 100 Myr. The slope of the relation between log( SFR/M_⊙ yr^-1) and log(L_ [O_III]/ L_⊙) at z=6-9 is 1.03, and 1.43 for log(L_ [C_II]/ L_⊙). As gas metallicity increases from sub-solar to solar metallicity by metal enrichment from star formation and feedback, the line luminosity ratio L_ [O_III] / L_ [C_II] decreases from ∼ 10 to ∼ 1 because the O/C abundance ratio decreases due to carbon-rich winds from AGB stars and the mass ratio of H ii to H i regions decreases due to rapid recombination. Therefore, we suggest that the combination of [O III] and [C II] lines is a good probe to investigate the relative distribution of ionized and neutral gas in high-z galaxies. In addition, we show that deep [C II] observations with a sensitivity of ∼ 10^-2  mJy arcsec^-2 can probe the extended neutral gas disks of high-z galaxies.
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Date   2020-09-10
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arXiv  2001.01853v2
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