SMUDGes. III. The Southern catalog

The catalog is most complete for physically large (r_e_>2.5kpc) UDGs lying in the redshift range 1800<~cz/km.s^-1^<~7000, where the lower bound is defined by where incompleteness becomes significant for large objects on the sky and the upper bound by our minimum angular size selection criterion.

Because physical size is integral to the definition of a UDG, we develop a method of distance estimation using existing redshift surveys. With three different galaxy samples, two of which contain UDGs with spectroscopic redshifts, we estimate that the method has a redshift accuracy of ~75% when the method converges, although larger, more representative spectroscopic UDG samples are needed in order to fully understand the behavior of the method.