NGC 3521: Stellar Counter-Rotation Induced by a Bar Component
NGC 3521: Stellar Counter-Rotation Induced by a Bar Component
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NGC 3521：棒成分引起的恒星反向旋转
DOI：
10.1023/a:1017548101623
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发表时间：
2001
影响因子：
1.9
通讯作者：
F. Bertola
中科院分区：
文献类型：
--
作者：
W. Zeilinger;J. C. Vega Beltrán;M. Rozas;J. Beckman;A. Pizzella;E. Corsini;F. Bertola
螺旋星系NGC 3521在其长轴上表现出气体和恒星沿着的正常运动学性质。然而，分析的LOSVD揭示了强烈的不对称性。一个分解的LOSVD数据与两个高斯分量模型显示两个反向旋转的恒星组件。所观察到的运动解耦被解释为一个酒吧组件的存在下，几乎看到endon.The酒吧产生本地更大的浓度逆行恒星轨道引起的投影效应，但这并不涉及到一个特定的反旋转人口。在由长、短和45°中间轴沿着的长缝谱和R波段表面光度测量得到的速度场中，识别出了棒的特征。
The spiral galaxy NGC 3521 exhibits apparently normal kinematic properties of gas and stars along its major axis. However, the analysis of the LOSVD reveals strong asymmetries. A decomposition of the LOSVD data with a two-Gaussian component model shows two counter-rotating stellar components. The observed kinematic decoupling is interpreted as a projection effect induced by the presence of a bar component seen almost end on. The bar produces locally a greater concentration of retrograde stellar orbits but this does not relate to a specific counter-rotating population. The signatures of the bar are identified in the velocity field derived from long-slit spectra obtained along the major, minor and 45° intermediate axes and from R-band surface photometry.