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We present the analysis of the full MaNGA DR17 sample to characterize itspopulation of compact galaxies. We focus on galaxies that fill the stellar mass(M$_{\star}$) gap between compact elliptical galaxies (cEs; $8 \lesssim \log\left(M_{\star} / M_{\odot} \right) \lesssim 10$) and compact massive galaxies(CMGs; $10 \lesssim \log \left(M_{\star} / M_{\odot} \right)$). We study theirstellar populations and kinematics to reveal how their properties depend onstellar mass. We select compact galaxies in the MaNGA DR17 sample according totheir effective radius ($R_e$) and stellar mass. 37 galaxies fulfill ourselection criteria in the bridging region between cEs and CMGs. We derive theirkinematics and stellar population parameters from the stacked spectra at1~$R_e$ using a full spectral fitting routine. We then classify the selectedcompact galaxies in three main groups based on their stellar populationproperties. One of the groups shows characteristics compatible with relicgalaxies, i.e. galaxies that have remained mostly unchanged since their earlyformation epoch ($z \sim 2$). Another group shows more extended and continuousstar formation histories (SFHs). The third group shows a low star-forming rateat initial times, which increases at around $\sim4$ Gyr. We compare the derivedproperties of the selected galaxies with those of previously studied compactgalaxies at different mass ranges. The selected galaxies successfully fill themass gap between cEs and CMGs. Their properties are compatible with theassumption that the scaling relations of compact galaxies at different massranges are related, although galaxies in the first group are clear outliers inthe fundamental plane, suggesting different formation mechanisms for this relicpopulation.

Bridging the gap in the mass-size relation of compact galaxies with MaNGA