SIMBAD references

We have determined the H α emission line radial profiles for a sample of 86 face-on galaxies observed in the Calar Alto Legacy Integral Field Area (CALIFA) survey and analysed with the PIPE3D pipeline. From a visual analysis we propose a two-step classification of these profiles. Initially, they were divided in two classes with respect to the maximum of the H α emission: C (for central) profiles have the maximum line emission at the galaxy centre, whereas EX (for extended) profiles have the maximum H α emission outside the galaxy centre. After, we divided the C galaxies in two classes, CE and CL (where E and L stand here for 'early' and 'late'), through the value of c_r, the concentration index in the r band. We analysed the profile class dependence of several galaxy parameters, as well as examined the nature of line emission through the Baldwin-Phillips-Terlevich (BPT) diagram. We notice that almost 75 per cent of the sample is in the C class. Elliptical and S0 galaxies dominate the CE class, with spiral galaxies being found mostly in the CL and EX classes. We also notice that spirals in each of these classes have different properties, with CL objects seeming less evolved than those in the EX class.