Ram pressure stripping of disc galaxies: the role of the inclination angle

Ram pressure stripping of disc galaxies: the role of the inclination angle
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圆盘星系的冲压压力剥离:倾角的作用

DOI:
10.1111/j.1365-2966.2006.10335.x
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发表时间:
2006
影响因子:
4.8
通讯作者:
Brüggen
Brüggen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Roediger;Brüggen

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我们提出了星团中大质量盘状星系冲压压力剥离的三维 (3D) 流体动力学模拟。对面对面移动的星系的研究预测,在这种几何形状中,星系可能会失去大量的星际介质。但只有一小部分星系正在正面移动。在这项工作中,我们重点系统地研究了运动方向与星系旋转轴之间的倾角的影响。与之前的一些工作一致,我们发现只要星系不接近边缘移动(倾角≲60°),倾角就不会在质量损失中发挥主要作用。我们通过将 Gunn & Gott 对剥离半径的估计(对于正面几何形状有效)扩展到适度的倾角来解释这种行为。只要冲压压力与银河平面中的压力相当(可以跨越两个数量级),倾角就会发挥作用。对于非常强的冲压压力,圆盘将被完全剥离,而对于非常弱的冲压压力,质量损失可以忽略不计,与倾斜度无关。我们表明,在非边缘几何形状中,剥离过程非常相似。不同倾角之间的主要区别是剩余气体盘中引入的不对称程度。我们证明,从星系中剥离的气体尾部不一定指向与星系运动方向相反的方向。因此,对星系气体尾部的观察可能会误导星系的运动方向。
We present three-dimensional (3D) hydrodynamical simulations of ram pressure stripping of massive disc galaxies in clusters. Studies of galaxies that move face-on have predicted that in such a geometry the galaxy can lose a substantial amount of its interstellar medium. But only a small fraction of galaxies is moving face-on. In this work we focus on a systematic study of the effect of the inclination angle between the direction of motion and the galaxy's rotation axis.In agreement with some previous works, we find that the inclination angle does not play a major role for the mass loss as long as the galaxy is not moving close to edge-on (inclination angle ≲60°). We explain this behaviour by extending Gunn & Gott's estimate of the stripping radius, which is valid for face-on geometries, to moderate inclinations.The inclination plays a role as long as the ram pressure is comparable to pressures in the galactic plane, which can span two orders of magnitude. For very strong ram pressures, the disc will be stripped completely, and for very weak ram pressures, mass loss is negligible independent of inclination. We show that in non-edge-on geometries the stripping proceeds remarkably similar. A major difference between different inclinations is the degree of asymmetry introduced in the remaining gas disc.We demonstrate that the tail of gas stripped from the galaxy does not necessarily point in a direction opposite to the galaxy's direction of motion. Therefore, the observation of a galaxy's gas tail may be misleading about the galaxy's direction of motion.
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DOI: --
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期刊:
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