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arXiv 1408.4274astro-ph.GA
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双棒星系的斑图速度比

The ratio of pattern speeds in double-barred galaxies

Joan Font, John E. Beckman, Javier Zaragoza-Cardiel, Kambiz Fathi, Benoît Epinat, Philippe Amram

摘要:

用扫描法布里-珀罗光谱仪测量了8个双棒星系的H $α$发射场,获得了它们电离气体的高空间分辨率和高光谱分辨率的二维速度场。利用非圆运动中的相位反转指示共转半径的技术,利用高的角分辨率和速度分辨率,我们获得了每个星系中的主棒和小中心棒的共转半径和图案速度;文献中很少有这样的测量。我们的研究结果表明,内杆旋转速度比外杆的一个因素之间的3.3和3.6。

英文摘要:

We have obtained two-dimensional velocity fields in the ionized gas of a set of 8 double-barred galaxies, at high spatial and spectral resolution, using their H$α$ emission fields measured with a scanning Fabry-Perot spectrometer. Using the technique by which phase reversals in the non-circular motion indicate a radius of corotation, taking advantage of the high angular and velocity resolution we have obtained the corotation radii and the pattern speeds of both the major bar and the small central bar in each of the galaxies; there are few such measurements in the literature. Our results show that the inner bar rotates more rapidly than the outer bar by a factor between 3.3 and 3.6.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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