UNCOVERING THE ORIGINS OF SPIRAL STRUCTURE BY MEASURING RADIAL VARIATION IN PATTERN SPEEDS

UNCOVERING THE ORIGINS OF SPIRAL STRUCTURE BY MEASURING RADIAL VARIATION IN PATTERN SPEEDS
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通过测量图案速度的径向变化来揭示螺旋结构的起源

DOI:
10.1088/0004-637x/702/1/277
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发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Meidt S
Meidt S
中科院分区:
--
文献类型:
--
作者:
Meidt S

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当前的螺旋和杆状结构理论预测了各种模式速度行为,要求对模式速度的径向变化进行详细、直接的测量。我们最近开发的径向Tremaine-Weinberg(TWR)方法首次实现了这一目标。在这里,我们给出了M101、IC 342、NGC 3938和NGC 3344的TWR螺旋图案速度估计,以调查螺旋结构是稳定的还是卷曲的,螺旋线是否由多个图案速度描述,以及条形和螺旋速度之间的关系。在可能的情况下,我们根据与之相关的共振半径(与圆盘的角度旋转建立)来解释我们的模式速度估计,并将其与先前的确定进行比较。通过分析这些星系可用的高质量HI和CO数据立方体,我们表明,有可能直接确定这些星系中的多种模式速度,从而识别驱动螺旋结构的过程的特征特征。即使是这个小样本星系也揭示了一个令人惊讶的复杂的分类学,在一些系统中发现了存在多种模式共振耦合的第一个直接证据,在其他系统中测量到了简单的单一模式速度。总体而言,这项研究表明,我们现在能够揭开更多隐藏在螺旋结构背后的表面上复杂的物理现象。
Current theories of spiral and bar structure predict a variety of pattern speed behaviors, calling for detailed, direct measurement of the radial variation of pattern speeds. Our recently developed Radial Tremaine–Weinberg (TWR) method allows this goal to be achieved for the first time. Here, we present TWR spiral pattern speed estimates for M101, IC 342, NGC 3938, and NGC 3344 in order to investigate whether spiral structure is steady or winding, whether spirals are described by multiple pattern speeds, and the relation between bar and spiral speeds. Where possible, we interpret our pattern speeds estimates according to the resonance radii associated with each (established with the disk angular rotation), and compare these to previous determinations. By analyzing the high-quality H i and CO data cubes available for these galaxies, we show that it is possible to determine directly multiple pattern speeds within these systems, and hence identify the characteristic signatures of the processes that drive the spiral structure. Even this small sample of galaxies reveals a surprisingly complex taxonomy, with the first direct evidence for the presence of resonant coupling of multiple patterns found in some systems, and the measurement of a simple single-pattern speed in others. Overall, this study demonstrates that we are now in a position to uncover more of the apparently complex physics that lies behind spiral structure.
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