Photon Feedback: Screening and the Eddington Limit
  Bright star-forming galaxies radiate well below their Eddington Limit. The
value of the flux-mean opacity that mediates the radiation force onto matter is
orders of magnitude smaller than the UV or optical dust opacity. On empirical
grounds, it is shown that high-redshift ULIRGs radiate at two orders of
magnitude below their Eddington Limit, while the local starbursters M82 and Arp
220 radiate at a few percent of their Eddington Limit. A simple model for the
radiative transfer of UV and optical light in dust-rich environments is
considered. Radiation pressure on dust does not greatly affect the large-scale
gas dynamics of star-forming galaxies.
