The Diverse Population of ULIRGs
  We present results from an on-going Hubble Space Telescope (HST) survey of a large sample of ULIRGs (Ultra-Luminous IR Galaxies). New ground-based observations are now being used to complement the HST data and to assist in the interpretation of these complex objects. A rich spectroscopic, morphological, and dynamical diversity is found within the ULIRG population, nearly 100% of which are merger and/or collision remnants. The consequences of this diversity may apply to the interpretation of distant submm/FIR sources and their subsequent evolution. 
K. D. Borne (1 and 2), S. Arribas (3), H. Bushouse (3), L. Colina (4),   R. A. Lucas (3) ((1) Raytheon Information Technolog...