SDSS-IV MANGA: Spatially Resolved Star Formation Main Sequence and LI(N)ER Sequence
Abstract
We present our study on the spatially resolved Halpha and Mstar relation for 536 star-forming and 424 quiescent galaxies taken from the MaNGA survey. We show that the star formation rate surface density (SigmaSFR), derived based on the Halpha emissions, is strongly correlated with the Mstar surface density (Sigmastar) on kpc scales for star- forming galaxies and can be directly connected to the global star-forming sequence. This suggests that the global main sequence may be a consequence of a more fundamental relation on small scales. On the other hand, our result suggests that about 20% of quiescent galaxies in our sample still have star formation activities in the outer region with lower SSFR than typical star-forming galaxies. Meanwhile, we also find a tight correlation between SigmaHalpha and Sigmastar for LI(N)ER regions, named the resolved "LI(N)ER" sequence, in quiescent galaxies, which is consistent with the scenario that LI(N)ER emissions are primarily powered by the hot, evolved stars as suggested in the literature.
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