VizieR Online Data Catalog: Classification of emission-line galaxies (Stampoulis+, 2019)

The SDSS provides an excellent resource of spectra of the central regions (~5.5kpc for z<0.1) of galaxies covering all different activity types (e.g. Kauffmann et al. 2003MNRAS.346.1055K). For the definition of our multidimensional activity diagnostics we use the 'galspec' data base of spectral-line measurements from the Max-Plank Institute for Astronomy and Johns Hopkins University group. We used the version of the catalogue made publicly available through the SDSS Data Release 8 (Aihara et al. 2011ApJS..193...29A, 2011ApJS..195...26A; Eisenstein et al. 2011AJ....142...72E), which contains 1843200 objects.

Since the same catalogue has been used for the definition of the two-dimensional and multidimensional diagnostics of Kauffmann et al. (2003MNRAS.346.1055K) and Vogt et al. (2014ApJ...793..127V), respectively, it is the best benchmark for testing the SoDDA. Before proceeding with our analysis, we applied the corrections on the line-measurement errors reported in Juneau et al. (2014ApJ...788...88J), and we corrected the flux of the Hβ line following Groves, Brinchmann & Walcher (2012MNRAS.419.1402G).

The final sample consists of 130799 galaxies, and it provides a direct comparison with the reference diagnostics of Kauffmann et al. (2003MNRAS.346.1055K) and Kewley et al. (2006MNRAS.372..961K), which have used very similar selection criteria.

(1 data file).