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We present the galaxy size-mass ($R_{e}-M_{\ast}$) distributions using astellar-mass complete sample of $\sim1.5$ million galaxies, covering $\sim100$deg$^2$, with $\log(M_{\ast}/M_{\odot})>10.2~(9.2)$ over the redshift range$0.2<z<1.0$ $(z<0.6)$ from the second public data release of the HyperSuprime-Cam Subaru Strategic Program. We confirm that, at fixed redshift andstellar mass over the range of $\log(M_{\ast}/M_{\odot})<11$, star-forminggalaxies are on average larger than quiescent galaxies. The large sample ofgalaxies with accurate size measurements, thanks to the excellent imagingquality, also enables us to demonstrate that the $R_{e}-M_{\ast}$ relations ofboth populations have a form of broken power-law, with a clear change of slopesat a pivot stellar mass $M_{p}$. For quiescent galaxies, below an (evolving)pivot mass of $\log(M_{p}/M_{\odot})=10.2-10.6$ the relation follows$R_{e}\propto M_{\ast}^{0.1}$; above $M_{p}$ the relation is steeper andfollows $R_{e}\propto M_{\ast}^{0.6-0.7}$. For star-forming galaxies, below$\log(M_{p}/M_{\odot})\sim10.7$ the relation follows $R_{e}\proptoM_{\ast}^{0.2}$; above $M_{p}$ the relation evolves with redshift and follows$R_{e}\propto M_{\ast}^{0.3-0.6}$. The shallow power-law slope for quiescentgalaxies below $M_{p}$ indicates that large low-mass quiescent galaxies havesizes similar to those of their counterpart star-forming galaxies. We take thisas evidence that large low-mass quiescent galaxies have been recently quenched(presumably through environment-specific process) without significantstructural transformation. Interestingly, the pivot stellar mass of the$R_{e}-M_{\ast}$ relations coincides with mass at which half of the galaxypopulation is quiescent, implied that the pivot mass represents the transitionof galaxy growth from being dominated by in-situ star formation to beingdominated by (dry) mergers.

Hyper Suprime-Cam Subaru Strategic Program: A Mass-Dependent Slope of the Galaxy Size-Mass Relation at $z<1$