恒星星族对合并剩余动力学的影响
The Impact of Stellar Populations on the Dynamics of Merger Remnants
摘要：
许多研究和模拟表明，富含气体的合并对星系的整体恒星形成率和总质量函数没有显着贡献。用1.62或2.29微米的CO带头测量的发光和超铝红外星系的速度色散（σ）意味着它们将形成m < m* 椭圆星系。然而，在0.85微米处获得的钙II三重态（CaT）的σ表明所有类型的合并都将形成m > m* 椭圆星系。这里介绍的是最近的结果，基于高分辨率成像和多波长光谱学，它证明了红超巨星（RSG）或渐近巨星分支（AGB）恒星的核盘在近红外波段的主导地位，在那里尘埃遮蔽不足以阻止他们的签名。这些恒星的存在严重影响了动力学质量。在I波段，尘埃可以充分阻挡RSG或AGB恒星，LIRGs在很大的动态范围内占据基本面，几乎无法与椭圆星系区分开来。
英文摘要：
Many studies and simulations suggest gas-rich mergers do not contribute significantly to the overall star-formation rate and total mass function of galaxies. The velocity dispersions (sigma) of Luminous & Ultraluminous Infrared Galaxies measured using the 1.62 or 2.29 micron CO bandheads imply they will form 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 and multi-wavelength spectroscopy, which demonstrate the dominance of a nuclear disk of Red Supergiants (RSG) or Asymptotic Giant Branch (AGB) stars in the near-infrared bands, where dust obscuration does not sufficiently block their signatures. The presence of these stars severely biases the dynamical mass. At I-band, where dust can sufficiently block RSG or AGB stars, LIRGs populate the Fundamental Plane over a large dynamic range and are virtually indistinguishable from elliptical galaxies.
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