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We present a spectral decomposition technique that separates the contributionof different kinematic components in galaxies from the observed spectrum. Thisallows to study the kinematics and properties of the stellar populations of theindividual components (e.g., bulge, disk, counter-rotating cores, orthogonalstructures). Here, we discuss the results of this technique for galaxies thathost counter-rotating stellar disks of comparable size. In all the studiedcases, the counter-rotating stellar disk is the less massive, the youngest andhas different chemical content (metallicity and alpha-elements abundance ratio)than the main galaxy disk. Further applications of the spectral decompositiontechnique are also discussed.

Counter-rotating disks in galaxies: dissecting kinematics and stellar populations with 3D spectroscopy