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Many studies and simulations suggest gas-rich mergers do not contributesignificantly to the overall star-formation rate and total mass function ofgalaxies. The velocity dispersions (sigma) of Luminous & Ultraluminous InfraredGalaxies measured using the 1.62 or 2.29 micron CO bandheads imply they willform m < m* ellipticals. Yet, sigma's obtained with the Calcium II triplet(CaT) at 0.85 micron suggest all types of mergers will form m > m* ellipticals.Presented here are recent results, based on high-resolution imaging andmulti-wavelength spectroscopy, which demonstrate the dominance of a nucleardisk of Red Supergiants (RSG) or Asymptotic Giant Branch (AGB) stars in thenear-infrared bands, where dust obscuration does not sufficiently block theirsignatures. The presence of these stars severely biases the dynamical mass. AtI-band, where dust can sufficiently block RSG or AGB stars, LIRGs populate theFundamental Plane over a large dynamic range and are virtuallyindistinguishable from elliptical galaxies.

The Impact of Stellar Populations on the Dynamics of Merger Remnants