Spectral classification of emission-line galaxies

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Cosmic X-ray surveys of distant active galaxies (2015, background): “…of the X-ray sources (e.g., identification of broad emission lines; measuring the emission-line gas conditions from emission-line ratios; e.g., Veilleux and Osterbrock 1987; Kewley et al 2013) and the identification of the large-scale structure environment in which they reside (e.g.,…”
Active galactic nuclei: what’s in a name? (2017, background): “4; Baldwin et al. 1981; Veilleux and Osterbrock 1987; Kewley et al. 2001; Kauffmann et al. 2003a; Kewley et al. 2006.”