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We investigate the physical properties of Lyman-alpha emitters (LAEs) and non-Lyman-alpha emitters (non-LAEs) at z4. 8--9. 6 via a stacking analysis of 253 JWST/NIRSpec spectra of galaxies observed as part of the JWST Advanced Deep Extragalactic Survey (JADES). We identify a sample of 42 LAEs with the equivalent width of Ly 20 and a sample of 211 non-LAEs, divide each sample further via the median redshift of the LAEs (z~6. 3), and create composite spectra using the low and medium resolution spectra from NIRSpec. We estimate physical quantities such as dust extinction, UV continuum slope, electron temperatures, ionization parameter, escape fraction of Ly and Lyman Continuum, and the photon production rate for each bin/stack. The existing dust-extinction laws do not appear to be valid at these epochs. The emission line ratio analyses show that active galactic nuclei might dominate all sub-samples, irrespective of Ly emission. LAEs show much higher OIII/OII and low OII/H at z6. 3 compared to non-LAEs, but these line ratios are not sufficient to distinguish the two populations at z>6. 3. However, the LAEs samples show large EW (OIII4959, 5007) (>1000) compared to the non-LAEs sample at all redshifts. CIV/Ly and CIV/CIII] for LAE population at z6. 3 is a factor of 5 larger than that for LAE population at z>6. 3. The ionizing radiation for LAEs is hard, as revealed from several diagnostics, including CIV detection, high OIII/OII (>8), and large values of ^₈₎₍.
Kumari et al. (Mon,) studied this question.
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