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arXiv 1804.04536astro-ph.GA
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M33与M31近期相互作用的流体动力学模拟中潮汐诱导的形态

Tidally induced morphology of M33 in hydrodynamical simulations of its recent interaction with M31

Marcin Semczuk, Ewa L. Lokas, Jean-Baptiste Salomon, E. Athanassoula, Elena D'Onghia

摘要:

我们提出了一个M33的流体动力学模型和它最近与M31的相互作用。这种情况以前曾在文献中提出,以解释M33扭曲的气体和恒星盘,以及大约2 Gyr前两个物体中恒星形成率的增加。我们使用了轨道积分方案,以找到M31的横向速度的估计更有利于相互作用的情况下,然后试图重现它在我们的模拟。M33被模拟为一个嵌入在活动暗物质晕中的恒星和气体盘,而M31则近似为一个活动的暗物质晕。在模拟中,两个星系以37 kpc的近心距离相互通过。潮汐激发了M33盘中的双臂螺旋结构,这被认为是观测星系中的主要螺旋信号,并且长期以来一直被认为是潮汐相互作用容易引起的特征。我们发现,由相互作用产生的气体翘曲没有足够的相似,观察到的,我们进行了额外的模拟,包括热气晕的M31表明,这一功能可以正确地再现潮汐力和冲压压力剥离同时作用于气体盘。除了旋臂,潮汐力产生了类似于观测到的恒星流,并引发了类似于观测到的半径的恒星形成爆发。

英文摘要:

We present a hydrodynamical model of M33 and its recent interaction with M31. This scenario was previously proposed in the literature in order to explain the distorted gaseous and stellar disks of M33, as well as the increased star formation rate in both objects around 2 Gyr ago. We used an orbit integration scheme to find which estimate of the transverse velocity of M31 more favors the interaction scenario and then tried to reproduce it in our simulations. M33 was modeled as a stellar and gaseous disk embedded in a live dark-matter halo, while M31 was approximated only with a live dark halo. In the simulations the two galaxies passed each other with a pericenter distance of 37 kpc. Tides excited a two-armed spiral structure in the M33 disk, which is found to be the predominant spiral signal in the observed galaxy and has been long known as a feature easily induced by tidal interactions. We found that the gaseous warp produced by the interaction did not resemble enough the observed one and we performed an additional simulation including the hot gas halo of M31 to show that this feature can be properly reproduced by tidal forces and ram pressure stripping acting simultaneously on the gaseous disk. In addition to the spiral arms, tidal forces produced the stellar stream similar to the observed one and triggered a star formation burst at similar radii as it is observed.

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