Existing HeII emission-line diagnostics identify pure Pop III galaxies but fail for hybrid Pop III/Pop II systems, introducing spectral degeneracies that hide residual first stars.
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A homogeneous analysis of 699 spectra yields Te-Te relations for ions including N II, O II, O III, S II, S III and Ar III, with lower dispersions for relations involving Te([N II]).
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On the detection of Population III galaxies: Emission Line Diagnostics for Hybrid Stellar Populations
Existing HeII emission-line diagnostics identify pure Pop III galaxies but fail for hybrid Pop III/Pop II systems, introducing spectral degeneracies that hide residual first stars.
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The DESIRED electron temperature relations in star-forming regions of the local Universe
A homogeneous analysis of 699 spectra yields Te-Te relations for ions including N II, O II, O III, S II, S III and Ar III, with lower dispersions for relations involving Te([N II]).