Systematically Measuring Ultra-diffuse Galaxies. VI

We identify 325 SMUDGes galaxies with NSCs and, from the 144 with existing distance estimates, identify 33NSC hosts as UDGs ({mu}_0,g_>~24mag/arcsec^2^, r_e_>~1.5kpc). The SMUDGes with NSCs lie on the galaxy red sequence, satisfy the relationship between NSC and host galaxy stellar masses, have a mean NSC stellar mass fraction of 0.02 but reach as high as 0.1, have NSCs that are displaced from the host center with a standard deviation of 0.10r_e_, and weakly favor higher-density environments.

All of these properties are consistent with previous results from higher surface brightness galaxy samples, allowing for at most a relatively weak dependence of NSC behavior on host galaxy surface brightness.