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arXiv 1408.6844astro-ph.GA
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运动学上不同的核心和短轴旋转:从MUSE角度看M87

A kinematically distinct core and minor-axis rotation: the MUSE perspective on M87

Eric Emsellem, Davor Krajnovic, Marc Sarzi

摘要:

我们目前的证据表明,在巨大的早期型星系M87中存在一个低振幅的运动学不同的组件,通过数据集获得的SAURON和MUSE积分场光谱单位。MUSE速度场揭示了在中心30弧秒内的~140度的强烈扭曲,将这样一个运动学上不同的核心连接到围绕星系大尺度光度主轴的长轴状旋转。这些运动学特征在M87中心区域的存在意味着这个星系的非轴对称和复杂的形状,这可以进一步限制使用所提出的运动学。相关的轨道结构应该与在更大尺度上探测的引力势的其他示踪物一起解释(例如,球状星团、超致密矮星、行星状星云):它将提供对室女星系团中最明亮星系之一的组装历史的深入了解。这些数据也证明了MUSE光谱仪发现低振幅光谱特征的潜力。

英文摘要:

We present evidence for the presence of a low-amplitude kinematically distinct component in the giant early-type galaxy M87, via datasets obtained with the SAURON and MUSE integral-field spectroscopic units. The MUSE velocity field reveals a strong twist of ~140 deg within the central 30 arcsec connecting outwards such a kinematically distinct core to a prolate-like rotation around the large-scale photometric major-axis of the galaxy. The existence of these kinematic features within the apparently round central regions of M87 implies a non-axisymmetric and complex shape for this galaxy, which could be further constrained using the presented kinematics. The associated orbital structure should be interpreted together with other tracers of the gravitational potential probed at larger scales (e.g., Globular Clusters, Ultra Compact Dwarfs, Planetary Nebulae): it would offer an insight in the assembly history of one of the brightest galaxies in the Virgo Cluster. These data also demonstrate the potential of the MUSE spectrograph to uncover low-amplitude spectral signatures.

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