Elliptical Galaxies,and Quasars to Tell Distance

Looking at a picture I have of quasar 1007+417 The picture was taken
by the "Very Large Array radio telescopes.(false coloring added) It
easy to theorize BH gravity is creating a hot disk outside its event
horizon;.(way outside ) This can be made to show distance.Coming closer
to home we have Radio Galaxies. Best to keep in mind we expect to see
light from galaxies,after all their structure is billions and billons of
stars. We know there are active galaxies that prodoce a much wider
range of EM radiation,and not just optical. This radiation is located
near the core. You see good science tells us at the center is a BH We
will use BH to tell distance. We know the hole itself is black but the
energy it produces from the BH gravity as it shreads the stars around
it (before swallowing) is very hot. Bert