Photometric Signature of Ultraharmonic Resonances in Barred Galaxies
Photometric Signature of Ultraharmonic Resonances in Barred Galaxies
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DOI：
10.3847/1538-4357/ac5d55
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发表时间：
2022-03
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通讯作者：
D. Krishnarao;Z. Pace;E. D’Onghia;J. Aguerri;R. McClure;T. Peterken;J. Fernández-Trincado;M. Merrifield;K. Masters;L. Garma-Oehmichen;N. Boardman;M. Bershady;N. Drory;R. Lane
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作者：
D. Krishnarao;Z. Pace;E. D’Onghia;J. Aguerri;R. McClure;T. Peterken;J. Fernández-Trincado;M. Merrifield;K. Masters;L. Garma-Oehmichen;N. Boardman;M. Bershady;N. Drory;R. Lane
杆可以通过它们的共振诱导形态特征，诸如环。以前的研究表明，“暗隙”的存在，或星系中表面亮度沿着棒长轴和沿着棒短轴的差异最大的区域，可以归因于棒共转的位置。在这里，使用GALAKOS，一个高分辨率的N体模拟的棒星系，我们测试这种光度方法的能力，以确定酒吧共转共振。与以前的工作相反，我们的研究结果表明，“暗隙”是一个明确的迹象的位置的4：1超谐波共振，而不是酒吧共转。棒共转的测量可以使用运动学信息间接推断，例如，通过测量旋转曲线的形状。我们证明了我们的概念上的样本578面对棒星系的成像和积分场观测，并发现该样本可能主要由快速酒吧。
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 that along the bar minor axis is 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 ultraharmonic 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 that the sample likely consists primarily of fast bars.