Abstract
Wide Field Slitless Spectroscopy (WFSS) provides a powerful tool for
detecting strong line emission in star forming galaxies (SFGs) without the need
for target pre-selection. As part of the GLASS-JWST-ERS program, we leverage
the near-infrared wavelength capabilities of NIRISS ($1-2.2\mu$m) to observe
rest-optical emission lines out to $z3.4$, to a depth and with a
spatial resolution higher than ever before (H$\alpha$ to z<2.4; OIII+H$\beta$
to z<3.4). In this letter we constrain the rest-frame OIII$łambda5007$
equivalent width (EW) distribution for a sample of 76 $1<z<3.4$ SFGs in
the Abell 2744 Hubble Frontier Field and determine an abundance fraction of
extreme emission line galaxies with EW$>750$A in our sample to be $12\%$. We
determine a strong correlation between the measured H$\beta$ and
OIII$łambda5007$ EWs, supporting that the high OIII$łambda5007$ EW
objects require massive stars in young stellar populations to generate the high
energy photons needed to doubly ionise oxygen. We extracted spectra for objects
up to 2 mag fainter in the near-infrared than previous WFSS studies with the
Hubble Space Telescope. Thus, this work clearly highlights the potential of
JWST/NIRISS to provide high quality WFSS datasets in crowded cluster
environments.
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