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Rotation curves have traditionally been difficult to trace for early-typegalaxies (ETGs) because they often lack a high-density disk of cold gas as inlate-type galaxies (LTGs). We derive rotation curves for three lenticulargalaxies from the ATLAS3D survey, combining CO data in the inner parts withdeep HI data in the outer regions, extending out to 10-20 effective radii. Wealso use Spitzer photometry at 3.6 um to decompose the rotation curves into thecontributions of baryons and dark matter (DM). We find that (1) therotation-curve shapes of these ETGs are similar to those of LTGs of similarmass and surface brightness; (2) the dynamically$-$inferred stellarmass-to-light ratios are small for quiescent ETGs but similar to those ofstar-forming LTGs; (3) the DM halos follow the same scaling relations withgalaxy luminosity as those of LTGs; (4) one galaxy (NGC 3626) is poorly fittedby cuspy DM profiles, suggesting that DM cores may exist in high-mass galaxiestoo. Our results indicate that these lenticular galaxies have recentlytransitioned from LTGs to ETGs without altering their DM halo structure (e.g.,via a major merger) and could be faded spirals. We also confirm that ETGsfollow the same radial acceleration relation as LTGs, reinforcing the notionthat this is a universal law for all galaxy types.

From spirals to lenticulars: evidence from the rotation curves and mass models of three early-type galaxies