CRDs galaxies candidates in SDSS-IV MaNGA

For 17 CRDs, the counter-rotating components can also be separated spectroscopically. The frequency of CRDs in MaNGA is <5 per cent for ellipticals, <3 per cent for lenticulars, and <1 per cent for spirals (at 95 per cent confidence level), consistent with previous estimates.

We produced age and metallicity maps, and compared the stellar population properties to those of the general ETGs population. We found that CRDs have similar trends in age and metallicity to ETGs, but are less metallic at low masses, and show flatter age and steeper metallicity gradients, on average. A comparison of the velocity fields of the ionized gas and the stars reveals that in 33 cases the gas corotates with either the inner (15 cases) or outer (18 cases) stellar disc, and in nine cases it is misaligned.