Spiral structure in barred galaxies. Observational constraints to spiral arm formation mechanisms

Spiral structure in barred galaxies. Observational constraints to spiral arm formation mechanisms
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棒星系中的螺旋结构。

DOI:
10.1093/mnras/sty2983
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发表时间:
2019
影响因子:
4.8
通讯作者:
Font J
Font J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Font J

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一种方法,我们已经制定了确定共转半径,使我们能够详细映射的棒旋星系的径向共振结构。在这里,我们已经结合了这些信息与新的确定的酒吧的强度和螺旋臂的最里面的一段的螺距角,找到这些参数之间的关系的相关星系的动力学演化。我们展示了(1)棒的质量分数,(2)标度棒的角动量,(3)俯仰角,(4)剪切参数如何沿着哈勃序列变化,我们还绘制了沿着哈勃序列(5)标度棒的长度,(6)标度棒的共转半径与棒的长度之比,(7)标度棒的图案速度,(8)棒的强度。值得注意的是,参数(2)、(5)、(6)、(7)和(8)都在Scd类型下显示出其行为的中断。我们发现,具有高剪切力的杆只有小的螺距角,而具有大螺距角的杆必须具有低剪切力;我们还发现螺距角与杆强度呈普遍相反的趋势。一个乍看起来似乎违反直觉的推论是,质量最大的棒旋转得最慢,但角动量最大。在另一组详细结果中,我们在这里选择了旋臂数量与棒外共转数量之间的2:1比例。这些结果对盘杆演化理论具有指导意义。
A method which we have developed for determining corotation radii, has allowed us to map in detail the radial resonant structures of barred spiral galaxies. Here we have combined this information with new determinations of the bar strength and the pitch angle of the innermost segment of the spiral arms to find relationships between these parameters of relevance to the dynamical evolution of the galaxies. We show how (1) the bar mass fraction, (2) the scaled bar angular momentum, (3) the pitch angle, and (4) the shear parameter vary along the Hubble sequence, and we also plot along the Hubble sequence (5) the scaled bar length, (6) the ratio of bar corotation radius to bar length, (7) the scaled bar pattern speed, and (8) the bar strength. It is of interest to note that the parameters (2), (5), (6), (7), and (8) all show breaks in their behaviour at type Scd. We find that bars with high shear have only small pitch angles, while bars with large pitch angles must have low shear; we also find a generally inverse trend of pitch angle with bar strength. An inference which at first seems counter-intuitive is that the most massive bars rotate most slowly but have the largest angular momenta. Among a further set of detailed results we pick out here the 2:1 ratio between the number of spiral arms and the number of corotations ouside that of the bar. These results give a guideline to theories of disc-bar evolution.
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DOI: 10.1086/184934
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