揭开Σ-离散II的面纱：重访ULIRGs的演化和类星体的起源
Unveiling The Sigma-Discrepancy II: Revisiting the Evolution of ULIRGs & The Origin of Quasars
摘要：
我们提出了第一个中心速度色散（σ_o）测量从0.85微米钙II三重态（CaT）的8个先进的（即单核）本地（z < 0.15）超铝红外线镓（ULIRGs）。首先，这些测量结果被用来检验“sigma-Discreplantation”的预测，其中CaT sigma_o系统地大于从1.6或2.3微米恒星CO带头获得的sigma_o，扩展到ULIRG光度。接下来，我们结合CAT数据与静止帧I-波段测光从档案哈勃太空望远镜数据和斯隆数字巡天（SDSS）获得的动力学特性的8 ULIRGs。然后将这些与SDSS中相同红移体积内的9，255个椭圆星系和相对较近（z < 0.4）的53个类星体宿主星系样本的动力学性质进行比较。比较了ULIRG的I带和H带动力学性质。我们发现了四个关键结果：在I波段，ULIRGs位于基本面（FP）上的区域与大质量椭圆星系一致，而不是以前报道的中低质量椭圆星系，在近红外波段，ULIRGs的M/L与古老的恒星星族一致，而在H波段，ULIRGs则明显较年轻，质量较小;（4）从SDSS椭圆星系中导出了I波段的Kormendy关系，证明了ULIRGs和类星体宿主星系在动力学上的相似性。
英文摘要：
We present the first central velocity dispersions (sigma_o) measured from the 0.85 micron Calcium II Triplet (CaT) for 8 advanced (i.e. single nuclei) local (z < 0.15) Ultraluminous Infrared Galaxies (ULIRGs). First, these measurements are used to test the prediction that the "sigma-Discrepancy," in which the CaT sigma_o is systematically larger than the sigma_o obtained from the 1.6 or 2.3 micron stellar CO band-heads, extends to ULIRG luminosities. Next, we combine the CaT data with rest-frame I-band photometry obtained from archival Hubble Space Telescope data and the Sloan Digital Sky Survey (SDSS) to derive dynamical properties for the 8 ULIRGs. These are then compared to the dynamical properties of 9,255 elliptical galaxies from the SDSS within the same redshift volume and of a relatively nearby (z < 0.4) sample of 53 QSO host galaxies. A comparison is also made between the I-band and H-band dynamical properties of the ULIRGs. We find four key results: 1) the sigma-Discrepancy extends to ULIRG luminosities; 2) at I-band ULIRGs lie on the Fundamental Plane (FP) in a region consistent with the most massive elliptical galaxies and not low-intermediate mass ellipticals as previously reported in the near-infrared; 3) the I-band M/L of ULIRGs are consistent with an old stellar population, while at H-band ULIRGs appear significantly younger and less massive; and 4) we derive an I-band Kormendy Relation from the SDSS ellipticals and demonstrate that ULIRGs and QSO host galaxies are dynamically similar.
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