Spatially resolved stellar mass buildup and quenching in massive disk galaxies over the last 10 Gyr revealed with spatially resolved SED fitting

Abstract

Despite decreasing cosmic star formation rate density over the last 10 Gyr, the stellar mass ($M_{\ast }$) buildups in galaxies were still progressing during this epoch. About 50\% of the current $M_{\ast }$ density in the universe was built over the last $\sim 8.7$ Gyr. In this research, we investigated the stellar mass buildup and quenching of spatially resolved regions within massive disk galaxies over the last 10 Gyr. We apply the spectral energy distribution (SED) fitting method to SEDs of sub-galactic regions in galaxies to derive the spatially resolved distributions of SFR and $M_{\ast }$ in the galaxies. This namely \textit{pixel-to-pixel SED fitting} method is applied to massive disk galaxies at $0.01<z<0.02$ and $0.8<z<1.8$. We found that massive disk galaxies tend to build their $M_{\ast }$ and quench their star formation progressively from the central region to the outskirts, i.e. \textit{inside-out} stellar mass buildup and quenching.

5 pages; to appear in the IAU proceeding PanModel2018: "Challenges in panchromatic galaxy modelling with next generation facilities"