Euclid on Sky
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Fig. 38

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Emission lines ratios in the Flagship simulation. Flagship galaxy fluxes (red colour map) compared to SDSS fluxes (grey map) from the main target sample for objects classified as galaxies in the local Universe. In blue, we also show FMOS stacked data in COSMOS from Kashino et al. (2019). Top panel: [O III]/Hβ versus [S II]/Hα. Bottom panel: [O III]/Hβ versus stellar mass; the thin dotted curves indicate the divisions between star-forming/composite galaxies and AGN at z ≃ 0 (Juneau et al. 2014), with AGN populating the region of larger [O III]/Hβ above the dotted lines.

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