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arXiv 1909.02582astro-ph.GA
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MUSE TIMER调查中椎间盘不稳定性和长期演化的运动学特征

Kinematical Signatures of Disc Instabilities and Secular Evolution in the MUSE TIMER Survey

Dimitri A. Gadotti, Adrian Bittner, Jesus Falcón-Barroso, Jairo Méndez-Abreu, the TIMER team

摘要:

MUSE TIMER巡天获得了21个邻近大质量盘星系内$\sim6\times6$ kpc的高信号和高空间分辨率积分场光谱数据。这使得研究的恒星运动学的中心区域的大规模盘星系是前所未有的空间分辨率。我们证实了以前的预测,从数值和流体动力学模拟的酒吧和内部酒吧对恒星和气体运动学的影响,并确定盒/花生通过运动学签名在轻度和中度倾斜的星系,包括一个盒子/花生在一个面对内部酒吧。在20/21星系中,我们发现内盘,并表明它们的属性是完全一致的酒吧驱动的长期演化图片为他们的形成。此外,我们表明,这些内盘,在他们占主导地位的区域,更大的旋转支持比主星系盘,并讨论如何可以使用它们的恒星星族属性来估计在宇宙历史上的主酒吧形成。我们的研究结果与光度研究的背景下,星系的性质,我们表明,内盘被确定在图像分解的光度膨胀与指数分布(即,序列指数接近统一)。

英文摘要:

The MUSE TIMER Survey has obtained high signal and high spatial resolution integral-field spectroscopy data of the inner $\sim6\times6$ kpc of 21 nearby massive disc galaxies. This allows studies of the stellar kinematics of the central regions of massive disc galaxies that are unprecedented in spatial resolution. We confirm previous predictions from numerical and hydrodynamical simulations of the effects of bars and inner bars on stellar and gaseous kinematics, and also identify box/peanuts via kinematical signatures in mildly and moderately inclined galaxies, including a box/peanut in a face-on inner bar. In 20/21 galaxies we find inner discs and show that their properties are fully consistent with the bar-driven secular evolution picture for their formation. In addition, we show that these inner discs have, in the region where they dominate, larger rotational support than the main galaxy disc, and discuss how their stellar population properties can be used to estimate when in cosmic history the main bar formed. Our results are compared with photometric studies in the context of the nature of galaxy bulges and we show that inner discs are identified in image decompositions as photometric bulges with exponential profiles (i.e., Sérsic indices near unity).

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