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- W3208736099 abstract "We determine the [OIII]$lambda5007$ equivalent width (EW) distribution of $1.700<rm{z}<2.274$ rest-frame UV-selected (M$_{rm{UV}}<-19$) star-forming galaxies in the GOODS North and South fields. We make use of deep HDUV broadband photometry catalogues for selection and 3D-HST WFC3/IR grism spectra for measurement of line properties. The [OIII]$lambda5007$ EW distribution allows us to measure the abundance of extreme emission line galaxies (EELGs) within this population. We model a log-normal distribution to the [OIII]$lambda5007$ rest-frame equivalent widths of galaxies in our sample, with location parameter $mu=4.24pm0.07$ and variance parameter $sigma= 1.33pm0.06$. This EW distribution has a mean [OIII]$lambda5007$ EW of 168$pm1r{A}$. The fractions of $rm{z}sim2$ rest-UV-selected galaxies with [OIII]$lambda5007$ EWs greater than $500, 750$ and $1000r{A}$ are measured to be $6.8^{+1.0}_{-0.9}%$, $3.6^{+0.7}_{-0.6}%$, and $2.2^{+0.5}_{-0.4}%$ respectively. The EELG fractions do not vary strongly with UV luminosity in the range ($-21.6<M_{rm{UV}}<-19.0$) considered in this paper, consistent with findings at higher redshifts. We compare our results to $rm{z}sim5$ and $rm{z}sim7$ studies where candidate EELGs have been discovered through Spitzer/IRAC colours, and we identify rapid evolution with redshift in the fraction of star-forming galaxies observed in an extreme emission line phase (a rise by a factor $sim10$ between $rm{z}sim2$ and $rm{z}sim7$). This evolution is consistent with an increased incidence of strong bursts in the galaxy population of the reionisation era. While this population makes a sub-dominant contribution of the ionising emissivity at $rm{z}simeq2$, EELGs are likely to dominate the ionising output in the reionisation era." @default.
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- W3208736099 date "2021-10-29" @default.
- W3208736099 modified "2023-10-16" @default.
- W3208736099 title "The [OIII]$lambda5007$ equivalent width distribution at z $sim2$: The redshift evolution of the extreme emission line galaxies" @default.
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