Abstract
Ultraluminous infrared galaxies (ULIRGs) form the dominant component of the local galaxy population at the highest luminosities (e.g., Sanders & Mirabel 1996 and references therein). They are major mergers of gas-rich galaxies and are characterized by a molecular interstellar medium (ISM) that is concentrated in the central kpc, where it forms a dynamically significant, or perhaps dominant, component (Scoville et al., 1991). Sanders et al. (1988) proposed that ULIRGs might harbor, or evolve into, dust-enshrouded quasars, formed in their obscured centers.
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