来自偏心碰撞的环形星系
Ring galaxies from off-centre collisions
摘要：
我们调查的形成RE星系（即碰撞环星系与空环），N体/SPH模拟。模拟采用了恒星形成（SF）和反馈的配方，已被证明是至关重要的，以产生现实的星系在宇宙学的背景下。我们表明，RE星系可以形成通过偏心碰撞（即与非零的碰撞参量），即使是小的倾角。根据初始条件（特别是碰撞参量），环可以是完整的环，也可以是圆弧。在我们的模拟中，目标星系的核从星系的动力中心移位，并被埋在环内，这是偏心碰撞的结果。我们发现，原子核并没有从环的平面垂直移位。我们研究了环的运动学，发现与解析理论的预测一致。模拟星系的SF历史表明，相互作用增强SF率。我们将模拟结果与RE星系原型Arp 147的观测结果进行了比较。
英文摘要：
We investigate the formation of RE galaxies (i.e. of collisional ring galaxies with an empty ring), with N-body/SPH simulations. The simulations employ a recipe for star formation (SF) and feedback that has been shown to be crucial to produce realistic galaxies in a cosmological context. We show that RE galaxies can form via off-centre collisions (i.e. with a non-zero impact parameter), even for small inclination angles. The ring can be either a complete ring or an arc, depending on the initial conditions (especially on the impact parameter). In our simulations, the nucleus of the target galaxy is displaced from the dynamical centre of the galaxy and is buried within the ring, as a consequence of the off-centre collision. We find that the nucleus is not vertically displaced from the plane of the ring. We study the kinematics of the ring, finding agreement with the predictions by the analytic theory. The SF history of the simulated galaxies indicates that the interaction enhances the SF rate. We compare the results of our simulations with the observations of Arp 147, that is the prototype of RE galaxies.
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