M. Schlickmann

TL;DR: In this article, the authors proposed to use the BPT diagram for galaxy classification and showed that the W Hα versus [N II]/Hα diagram can be applied to the largest sample of galaxies without loss of discriminating power between Seyferts and LINERs.

TL;DR: In this paper, the authors propose to use the SDSS DR7 data set for the classification of weak line galaxies (WLGs) by transposing the usual divisory lines between Star Forming (SF) and AGN hosts, and between Seyferts and LINERs to diagrams that are more economical in terms of line quality requirements.

TL;DR: In this paper, the authors argue that a large fraction of the systems in the right wing of galaxies could actually be galaxies which stopped forming stars and that the ionization in these ‘retired’ galaxies would be produced by hot post-asymptotic giant branch stars and white dwarfs.

TL;DR: In this article, the authors argue that a large fraction of the systems in the right wing of galaxies could actually be galaxies which stopped forming stars and that the ionization in these "retired" galaxies would be produced by hot post-AGB stars and white dwarfs.

TL;DR: In this article, the mass-metallicity relation at different lookback times for the same set of galaxies from the Sloan Digital Sky Survey was obtained using the stellar metallicities estimated with the spectral synthesis code STARLIGHT.