2D kinematics of simulated disc merger remnants
2D kinematics of simulated disc merger remnants
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DOI：
10.1111/j.1365-2966.2007.11524.x
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发表时间：
2006-06
影响因子：
4.8
通讯作者：
R. Jesseit;T. Naab;R. Peletier;A. Burkert
中科院分区：
文献类型：
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作者：
R. Jesseit;T. Naab;R. Peletier;A. Burkert
我们对质量比为 1:1 和 3:1 的模拟二元盘合并遗迹样本进行了二维运动学分析。对于祖盘，我们使用了纯恒星模型以及 10% 质量为气体的模型。在模拟中发现了在真实星系中也观察到的多种现象。这些包括未对准的旋转、嵌入式盘、气环、反向旋转核心 (CRC) 和运动未对准的盘。使用二维地图，我们说明了合并残余物中包含气体时的投影效应和属性变化。我们发现运动学特有子系统最好在等质量合并中形成。等质量无碰撞残骸可以表现出几乎没有旋转、规则旋转或强烈的运动失准。气体的加入使残余物看起来更圆（1:1）和轴对称（3:1）。 CRC 几乎完全是在具有耗散成分的等质量合并中形成的。 3:1 的残迹显示出更加规则的结构。我们通过应用 Krajnovic 等人最近开发的运动学方法来量化这些属性。这项工作将有助于理解使用积分场摄谱仪（如索伦）对椭圆星系的观测。
We present a 2D kinematic analysis for a sample of simulated binary disc merger remnants with mass ratios 1:1 and 3:1. For the progenitor discs we used pure stellar models as well as models with 10 per cent of their mass in gas. A multitude of phenomena also observed in real galaxies are found in the simulations. These include misaligned rotation, embedded discs, gas rings, counter-rotating cores (CRCs) and kinematic misaligned discs. Using the 2D maps we illustrate projection effects and the change in properties of a merger remnant when gas is included in the merger. We find that kinematic peculiar subsystems are preferably formed in equal-mass mergers. Equal-mass collisionless remnants can show almost no rotation, regular rotation or strong kinematic misalignment. The inclusion of gas makes the remnants appear more round (1:1) and axisymmetric (3:1). CRCs are almost exclusively formed in equal-mass mergers with a dissipational component. 3:1 remnants show a much more regular structure. We quantify these properties by applying the kinemetric methods recently developed by Krajnovic et al. This work will help to understand observations of elliptical galaxies with integral field spectrographs, like SAURON.