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arXiv 1401.3002astro-ph.GAastro-ph.CO
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星系内部动力学质量的形态学:一种与恒星总质量相关的弱标度

The Inner Dynamical Mass Across Galaxy Morphology: A Weak Scaling with Total Stellar Mass

Rachel Kuzio de Naray, Stacy S. McGaugh

摘要:

我们编译了一个样本的色散支持和旋转支持的星系,封闭在500 pc的动力学质量可以测量。我们发现,在重子质量为~9十年,长度标度为~3十年的时间内,这个动力学量只随恒星质量(M $_{total}$(<500 pc)$\propto$ M $_{stars}$ $^{0.16}$)缓慢增加,在最高质量(M $_{stars}$ > 10 $^{10}$ M $_{sun}$)时突然上升。这种上升发生在最早的类型(S 0和Sa)盘星系,并且与500 pc内的“额外”质量主要是恒星一致的。这种突然的变化可能表明早期和晚期盘之间不同的隆起形成机制。我们还比较了最近的星系形成模拟的结果的数据。这些大致跟踪观察到的趋势,根据每个模拟的细节,有一些倾向于在内部500 pc中放置太多的质量。

英文摘要:

We compile a sample of dispersion-supported and rotation-supported galaxies for which the dynamical mass enclosed at 500 pc can be measured. We find that this dynamical quantity increases only slowly with stellar mass (M$_{total}$(<500pc) $\propto$ M$_{stars}$$^{0.16}$) over ~9 decades in baryonic mass and ~3 in length scale, with a sudden upturn at the highest masses (M$_{stars}$ > 10$^{10}$M$_{sun}$). This upturn occurs for the earliest type (S0 and Sa) disk galaxies, and is consistent with the "extra" mass within 500 pc being predominantly stellar. This sudden change may be indicative of different bulge formation mechanisms between early and late type disks. We also compare the data to the results of recent galaxy formation simulations. These broadly track the observed trend, with some tendency to put too much mass in the inner 500 pc, depending on the details of each simulation.

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