论文标题
在禁止星系中超谐音共振的光度特征
Photometric Signature of Ultra-Harmonic Resonances in Barred Galaxies
论文作者
论文摘要
条形可能通过共鸣引起形态特征，例如环。先前的研究表明，“暗间隙”的存在或星系的区域，其中沿条形亮度沿杆轴轴线和钢筋较小轴的差异最大，这可以归因于条形脉络的位置。在这里，我们使用Galakos，这是对禁止星系的高分辨率N体模拟，我们测试了该光度法方法鉴定条旋转共振的能力。与以前的工作相反，我们的结果表明“暗隙”是4：1超谐音共鸣的位置而不是条旋转的明显迹象。可以通过测量旋转曲线的形状，例如，可以通过运动信息（例如，可以间接推断出条形旋转的测量值。我们在578个面对面禁止的星系的样本上展示了我们的概念，并具有成像和整体场观测值，发现样品可能主要由快速杆组成。
Bars may induce morphological features, such as rings, through their resonances. Previous studies suggested that the presence of 'dark-gaps', or regions of a galaxy where the difference between the surface brightness along the bar major axis and along the bar minor axis are maximal, can be attributed to the location of bar corotation. Here, using GALAKOS, a high-resolution N-body simulation of a barred galaxy, we test this photometric method's ability to identify the bar corotation resonance. Contrary to previous work, our results indicate that 'dark-gaps' are a clear sign of the location of the 4:1 ultra-harmonic resonance instead of bar corotation. Measurements of the bar corotation can indirectly be inferred using kinematic information, e.g., by measuring the shape of the rotation curve. We demonstrate our concept on a sample of 578 face-on barred galaxies with both imaging and integral field observations and find the sample likely consists primarily of fast bars.
