The Black Hole Mass and Extreme Orbital Structure in NGC 1399
The Black Hole Mass and Extreme Orbital Structure in NGC 1399
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DOI：
10.1086/522938
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发表时间：
2007-09
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影响因子：
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通讯作者：
K. Gebhardt;T. Lauer;J. Pinkney;R. Bender;D. Richstone;M. Aller;G. Bower;A. Dressler;S. Faber;A. Filippenko;R. Green;L. Ho;J. Kormendy;C. Siopis;S. Tremaine
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文献类型：
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作者：
K. Gebhardt;T. Lauer;J. Pinkney;R. Bender;D. Richstone;M. Aller;G. Bower;A. Dressler;S. Faber;A. Filippenko;R. Green;L. Ho;J. Kormendy;C. Siopis;S. Tremaine
最大的星系，特别是星系团中的中心星系，为理解核黑洞的生长机制提供了独特的见解。我们给出了天炉座中心星系ngc1399的哈勃空间望远镜运动学。我们发现最适合的模型包含一个（5.1±0.7）× 108 M☉的黑洞（距离21.1 Mpc），比黑洞质量和速度色散的相关性低2倍以上。我们还发现了中心切向各向异性的显著特征。在离核0.5″的相邻侧，速度谱表现出较强的双峰性，中心谱表现出较大的色散下降。这两个观测结果都指向一个切向偏置的轨道分布。最合适的轨道模型表明，切向与径向内部速度色散之比为3。这是迄今为止在所有星系中观测到的最大比例，并将为中心黑洞的生长模式提供重要的测量方法。
The largest galaxies, and in particular central galaxies in clusters, offer unique insight into understanding the mechanism for the growth of nuclear black holes. We present Hubble Space Telescope kinematics for NGC 1399, the central galaxy in Fornax. We find the best-fit model contains a black hole of (5.1 ± 0.7) × 108 M☉ (at a distance of 21.1 Mpc), a factor of over 2 below the correlation of black hole mass and velocity dispersion. We also find a dramatic signature for central tangential anisotropy. The velocity profiles on adjacent sides 0.5″ away from the nucleus show strong bimodality, and the central spectrum shows a large drop in the dispersion. Both of these observations point to an orbital distribution that is tangentially biased. The best-fit orbital model suggests a ratio of the tangential to radial internal velocity dispersions of 3. This ratio is the largest seen in any galaxy to date and will provide an important measure for the mode by which the central black hole has grown.