SIMBAD references

We present 226 large ultra-diffuse galaxy (UDG) candidates (r_e > 5.''3, µ_0,g > 24 mag arcsec^–2) in the SDSS Stripe 82 region recovered using our improved procedure developed in anticipation of processing the entire Legacy Surveys footprint. The advancements include less constrained structural parameter fitting, expanded wavelet filtering criteria, consideration of Galactic dust, estimates of parameter uncertainties and completeness based on simulated sources, and refinements of our automated candidate classification. We have a sensitivity ∼1 mag fainter in µ_0,g than the largest published catalog of this region. Using our completeness-corrected sample, we find that (1) there is no significant decline in the number of UDG candidates as a function of µ_0,g to the limit of our survey (∼26.5 mag arcsec^–2); (2) bluer candidates have smaller Sersic n; (3) most blue (g-r < 0.45 mag) candidates have µ_0,g <= 25 mag arcsec^–2 and will fade to populate the UDG red sequence we observe to ∼26.5 mag arcsec^–2; (4) any red UDGs that exist significantly below our µ_0,g sensitivity limit are not descendent from blue UDGs in our sample; and (5) candidates with lower µ_0,g tend to smaller n. We anticipate that the final SMUDGes sample will contain ∼30 x as many candidates.