Two distant galaxies at redshift 6.98 and 8.72 show narrow N V emission with no C IV or He II, and very high ionization lines appear in only about 2% of z>4 galaxies.
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JWST/NIRSpec Observations of High Ionization Emission Lines in Galaxies at High Redshift
Two distant galaxies at redshift 6.98 and 8.72 show narrow N V emission with no C IV or He II, and very high ionization lines appear in only about 2% of z>4 galaxies.