一个动态的失误：光学和红外Kinetics在合并中的差异研究
A Dynamical Miss: A Study of the Discrepancy Between Optical and Infrared Kinematics in Mergers
摘要：
最近，关于富含气体的螺旋-螺旋合并是否能够形成{ \it m $^{*}$ }椭圆星系的争论爆发了。局部LIRG/ULIRG的2.29 $\micron$ CO带头的$σ$ $_{\circ}$测量结果表明它们不是。红外明亮的合并经常被认为是形成大质量椭圆星系的最佳候选者，因此最近的观测对Toomre合并假说和$Λ$ -CDM星系形成模型的基本假设提出了质疑。然而，在8500光年处用钙II三重态获得的运动学表明，合并正在形成{ \it m} $\ge$ { \it m $^{*}$ }椭圆星系。在这项工作中，我们表明，运动学来自CO恒星吸收带头导致一个显着低估的LIRGs/ULIRGs的质量。这主要是由于存在一个年轻的人口影响CO带头测量。
英文摘要：
Recently, controversy has erupted over whether gas-rich spiral-spiral mergers are capable of forming {\it m$^{*}$} ellipticals. Measurements of $σ$$_{\circ}$ from the 2.29$\micron$ CO band-head for local LIRG/ULIRGs, suggest they are not. IR-bright mergers are often cited as the best candidates for forming massive ellipticals, so the recent observations have raised doubts about both the Toomre Merger Hypothesis and the fundamental assumptions of $Λ$-CDM galaxy formation models. However, kinematics obtained with the Calcium II Triplet at 8500 Å suggest mergers are forming {\it m} $\ge$ {\it m$^{*}$} ellipticals. In this work, we show that kinematics derived from the CO stellar absorption band-head leads to a significant underestimation of the masses of LIRGs/ULIRGs. This is primarily due to the presence of a young population affecting CO band-head measurements.
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