High-Velocity Outflows Without AGN Feedback: Eddington-Limited Star
  Formation in Compact Massive Galaxies
  We present the discovery of compact, obscured star formation in galaxies at z
~ 0.6 that exhibit >1000 km/s outflows. Using optical morphologies from the
Hubble Space Telescope and infrared photometry from the Wide-field Infrared
Survey Explorer, we estimate star formation rate (SFR) surface densities that
approach Sigma_SFR ~ 3000 Msun/yr/kpc^2, comparable to the Eddington limit from
radiation pressure on dust grains. We argue that feedback associated with a
compact starburst in the form of radiation pressure from massive stars and ram
pressure from supernovae and stellar winds is sufficient to produce the
high-velocity outflows we observe, without the need to invoke feedback from an
active galactic nucleus.
