The Impact of Stellar Populations on the Dynamics of Merger Remnants - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: 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 and 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 tripletCaT 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.



Author: B. Rothberg, J. Fischer Naval Research Laboratory, Remote Sensing Division, Code 7211

Source: https://arxiv.org/







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