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arXiv 1712.02802astro-ph.GA
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是什么让棒盘星系如此丰富:在旋转晕中阻尼恒星棒

What Makes the Family of Barred Disc Galaxies So Rich: Damping Stellar Bars in Spinning Haloes

Angela Collier, Isaac Shlosman, Clayton Heller

摘要:

我们模拟和分析了宇宙自旋λ ~ 0 - 0.09的自旋暗物质晕中恒星棒的长期演化。利用高分辨率的恒星和DM数值模拟,我们专注于恒星盘和DM晕的各种轴对称形状-球形,扁球形和长球形之间的角动量交换。我们发现,恒星酒吧经历了不同的演变,这是由母晕的能力,通过引力矩的作用,共振和非共振吸收光盘失去的角动量的指导。我们证实了前面的说法,动力杆不稳定性加速通过共振角动量转移到晕。我们的主要研究结果涉及长期的,长期的演化盘晕系统:随着λ的增加,酒吧经历较少的增长和溶解后,他们通过垂直屈曲不稳定。具体地说,随着晕旋转的增加,(1)恒星棒的垂直屈曲不稳定性与内晕不能吸收角动量相结合-这是削弱或破坏旋转晕中棒的主要因素:(2)棒损失的角动量逐渐减少,它们的模式速度趋于稳定;(3)棒较小,当λ>= 0.06时,它们在屈曲后完全停止增长;(4)λ> 0.03的棒具有正转与棒半径之比R_CR / R_b > 2,代表所谓的慢棒,它不显示偏移的尘埃带。我们提供了一个定量分析的角动量转移的盘晕系统,并解释的原因,没有增长的快速旋转晕和它的观测推论。我们的结论是,恒星酒吧的演变比预期的要复杂得多,酒吧并不像迄今为止所认为的那样有弹性。

英文摘要:

We model and analyse the secular evolution of stellar bars in spinning dark matter (DM) haloes with the cosmological spin lambda ~ 0 -- 0.09. Using high-resolution stellar and DM numerical simulations, we focus on angular momentum exchange between stellar discs and DM haloes of various axisymmetric shapes --- spherical, oblate and prolate. We find that stellar bars experience a diverse evolution which is guided by the ability of parent haloes to absorb angular momentum lost by the disc through the action of gravitational torques, resonant and non-resonant. We confirm the previous claim that dynamical bar instability is accelerated via resonant angular momentum transfer to the halo. Our main findings relate to the long-term, secular evolution of disc-halo systems: with an increasing lambda, bars experience less growth and dissolve after they pass through the vertical buckling instability. Specifically, with an increasing halo spin, (1) The vertical buckling instability in stellar bars colludes with inability of the inner halo to absorb angular momentum --- this emerges as the main factor weakening or destroying bars in spinning haloes; (2) Bars lose progressively less angular momentum, and their pattern speeds level off; (3) Bars are smaller, and for lambda >= 0.06 cease their growth completely following buckling; (4) Bars in lambda > 0.03 haloes have ratio of corotation-to-bar radii, R_CR / R_b > 2, and represent so-called slow bars which do not show offset dust lanes. We provide a quantitative analysis of angular momentum transfer in disc-halo systems, and explain the reasons for absence of growth in fast spinning haloes and its observational corollaries. We conclude that stellar bar evolution is substantially more complex than anticipated, and bars are not as resilient as has been considered so far.

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