THE SPATIALLY RESOLVED NUV–r COLOR OF LOCAL STAR-FORMING GALAXIES AND CLUES FOR QUENCHING

Using a sample of ~6,000 local face-on star-forming galaxies (SFGs), we examine the correlations between the NUV-r colors both inside and outside the half-light radius, stellar mass M* and S\'{e}rsic index n in order to understand how the quenching of star formation is linked to galaxy structure. For these less dust-attenuated galaxies, NUV-r is found to be linearly correlated with Dn4000, supporting that NUV-r is a good photometric indicator of stellar age (or specific star formation rate). We find that: (1) At M* 10^{10.2}M_{\sun}. (2) The central NUV-r shows no dependence on S\'{e}rsic index n at M* R_{50} region. In contrast, a considerable fraction of the M*>10^{10.2}M_{\sun} galaxies, especially those with a high n, have harbored a relatively inactive bulge component.