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Extreme emission line galaxies (EELGs) are a notable galaxy genus, ultimatelybeing regarded as local prototypes of early galaxies at the cosmic noon. Robustcharacterisation of their stellar content, however, is hindered by theexceptionally high nebular emission present in their optical spectroscopicdata. This study is dedicated into recovering the stellar properties of asample of 414 EELGs as observed by the SDSS Survey. Such is achieved by meansof the spectral synthesis code FADO, which self-consistently considers thestellar and nebular emission in an optical spectrum. Additionally, acomparative analysis was carried on, by further processing the EELGs samplewith the purely stellar spectral synthesis code Starlight, and by extending theanalysis to a sample of 697 normal star-forming galaxies, expected to be lessaffected by nebular contribution. We find that, for both galaxy samples,stellar mass and mean age estimates by Starlight are systematically biasedtowards higher values, and that an adequate determination of the physical andevolutionary properties of EELGs via spectral synthesis is only possible whennebular continuum emission is taken into account. Moreover, the differencesbetween the two population synthesis codes can be ascribed to the degree ofstar-formation activity through the specific star-formation rate and the sum ofthe flux of the most prominent emission lines. As expected, on the basis of thetheoretical framework, our results emphasise the importance of considering thenebular emission while performing spectral synthesis, even for galaxies hostingtypical levels of star-formation activity.

Characterisation of the stellar content of SDSS EELGs through self-consistent spectral modelling