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A TIGHT RELATION BETWEEN N/O RATIO AND GALAXY STELLAR MASS CAN EXPLAIN THE EVOLUTION OF STRONG EMISSION LINE RATIOS WITH REDSHIFT
2016
Astrophysical Journal
The offset of high redshift star-forming galaxies in the [OIII]/Hβ versus [NII]/Hα (O3N2) diagram in comparison with the local star-forming galaxy sequence is now well established. The physical origin of the shift is the subject of some debate, and has important implications for metallicity measurements based on strong lines at all redshifts. To investigate the origin of the O3N2 offset, we use a sample of 100,000 star-forming galaxies from SDSS DR12 to probe the empirical correlations between
doi:10.3847/0004-637x/828/1/18
fatcat:z24fmv7nw5alrpj2tpwanioida