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arXiv 0708.2822astro-ph
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Tully-Fisher关系的高质量端

The high mass end of the Tully-Fisher relation

E. Noordermeer, M. A. W. Verheijen

摘要:

我们研究了大质量盘星系的位置的塔利-费舍尔关系。结合使用K-波段测光和高质量的旋转曲线,我们表明,在传统的配方的TF关系(使用全球HI配置文件的宽度或最大旋转速度),星系的旋转速度大于200公里/秒的谎言系统的权利定义的关系,质量较低的系统,造成一个特征的“扭结”的关系。特别是大质量的早期型盘星系,与质量较小的晚期型螺旋星系的主要关系有很大的偏移,最大可达1.5等。Tully-Fisher关系的高质量端的斜率变化的存在对于使用Tully-Fisher关系作为估计星系距离或探测星系演化的工具具有重要影响。特别是,大质量星系自z = 1以来的光度演化可能比最近几项研究中估计的要大得多。我们还表明,许多星系的最大偏移量下降的旋转曲线和斜率的变化很大程度上消失时,我们使用的渐近旋转速度作为运动学参数。当我们同时使用重子总质量(恒星+气体)代替光学或近红外光度时,可以消除与线性的剩余偏差。我们的结果加强了这样一种观点,即塔利-费舍尔关系从根本上将暗物质晕的质量与嵌入其中的重子总质量联系起来。

英文摘要:

We study the location of massive disk galaxies on the Tully-Fisher relation. Using a combination of K-band photometry and high-quality rotation curves, we show that in traditional formulations of the TF relation (using the width of the global HI profile or the maximum rotation velocity), galaxies with rotation velocities larger than 200 km/s lie systematically to the right of the relation defined by less massive systems, causing a characteristic `kink' in the relations. Massive, early-type disk galaxies in particular have a large offset, up to 1.5 magnitudes, from the main relation defined by less massive and later-type spirals. The presence of a change in slope at the high-mass end of the Tully-Fisher relation has important consequences for the use of the Tully-Fisher relation as a tool for estimating distances to galaxies or for probing galaxy evolution. In particular, the luminosity evolution of massive galaxies since z = 1 may have been significantly larger than estimated in several recent studies. We also show that many of the galaxies with the largest offsets have declining rotation curves and that the change in slope largely disappears when we use the asymptotic rotation velocity as kinematic parameter. The remaining deviations from linearity can be removed when we simultaneously use the total baryonic mass (stars + gas) instead of the optical or near-infrared luminosity. Our results strengthen the view that the Tully-Fisher relation fundamentally links the mass of dark matter haloes with the total baryonic mass embedded in them.

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