Fig. 18
The relationship between the underlying Balmer absorption EW Hβabs and different parameters characterising the observed galaxies. From left to right, upper line: the morphological type, the logarithm of the total stellar mass (in M ⊙ ), the H band effective surface brightness (in mag arcsec-2); lower line: the logarithm of the birthrate parameter b, or equivalently the specific star formation rate SSFR, the metallicity index 12 + log(O/H), and the star formation rate (in M ⊙ yr-1). Blue symbols are for galaxies with a normal HI gas content (HI − def ≤ 0.4), red symbols for HI-deficient objects (HI − def > 0.4). Filled symbols indicate galaxies hosting an AGN. The black cross shows the typical uncertainty on the data for a galaxy of equivalent width of 5 Å.
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