Ram-pressure stripping of disc galaxies orbiting in clusters – II. Galactic wakes

Ram-pressure stripping of disc galaxies orbiting in clusters – II. Galactic wakes
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星团中绕轨道运行的圆盘星系的冲压压力剥离 â II 星系尾迹

DOI:
10.1111/j.1365-2966.2008.13415.x
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发表时间:
2008
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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我们提出了在星系团中绕轨道运行的盘状星系的冲压压力剥离的三维流体动力学模拟。在本文中,我们关注的是星系剥离气体尾部的性质。星系尾迹显示出一个耀斑的宽度,其中耀斑的角度取决于气体盘相对于星系运动方向的横截面。尾迹中的速度显示出几个显著的湍流分量。被剥离的气体在星团中沉积得相当局部,即在它被剥离的地方。我们证明了控制尾密度、长度和沿轨道气体质量分布的最重要的量是星系每轨道长度的质量损失。这反过来又取决于撞击的压力以及星系的轨道速度。对于投影气体密度的灵敏度极限,我们发现典型的尾长为。即使在离星团中心很远的地方(0.5到)也能看到这样的长尾。在这个灵敏度极限下,彗尾几乎没有明显的耀斑,但宽度与气体盘的大小相似。在形态学上,我们发现与室女座星系团中观测到的H - i尾巴很一致。然而,观测到的彗尾显示出的速度宽度比模拟预测的要小得多。已知的少数x射线和α尾巴通常比我们模拟中的尾巴窄得多,直得多。因此,可能需要额外的物理现象,如粘性簇内介质(ICM)、冷却和潮汐效应的影响来解释观测的细节。我们讨论了流体动力阻力作为ICM的热源,但得出的结论是,它不太可能发挥重要作用,特别是在停止冷却流动方面。
We present 3D hydrodynamical simulations of ram-pressure stripping of a disc galaxy orbiting in a galaxy cluster. In this paper, we focus on the properties of the galaxies' tails of stripped gas. The galactic wakes show a flaring width, where the flaring angle depends on the gas disc's cross-section with respect to the galaxy's direction of motion. The velocity in the wakes shows a significant turbulent component of a few. The stripped gas is deposited in the cluster rather locally, ie within from where it was stripped. We demonstrate that the most important quantity governing the tail density, length and gas mass distribution along the orbit is the galaxy's mass-loss per orbital length. This in turn depends on the ram pressure as well as the galaxy's orbital velocity. For a sensitivity limit of in projected gas density, we find typical tail lengths of. Such long tails are seen even at large distances (0.5 to) from the cluster centre. At this sensitivity limit, the tails show little flaring, but a width similar to the gas disc's size. Morphologically, we find good agreement with the H i tails observed in the Virgo cluster by. However, the observed tails show a much smaller velocity width than predicted from the simulation. The few known X-ray and Hα tails are generally much narrower and much straighter than the tails in our simulations. Thus, additional physics like a viscous intracluster medium (ICM), the influence of cooling and tidal effects may be needed to explain the details of the observations. We discuss the hydrodynamical drag as a heat source for the ICM but conclude that it is not likely to play an important role, especially not in stopping cooling flows.
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发表时间: 2006-06
期刊: The Astrophysical Journal
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