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arXiv 1002.1208astro-ph.GAastro-ph.CO
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尘埃对Tüve-Weinberg测量的影响

Dust effect on Tremaine-Weinberg measurements

J. Gerssen, V. P. Debattista

摘要:

我们研究了尘埃对用Tremaine & Weinberg(TW)方法测量的恒星棒自转速率的影响。由于该方法要求示踪物满足连续性方程,因此在早型棒星系中得到了广泛的应用。我们使用数值模拟的棒星系,通常发现在这些系统中的尘埃衰减因子改变了20- 40%的观察到的酒吧模式的速度。我们还解决了TW方法上的恒星形成的影响,并发现它不会显着改变结果。这表明TW方法的应用可以扩展到包括涵盖哈勃类型的全部范围的棒星系。

英文摘要:

We investigate the effect of dust on the observed rotation rate of a stellar bar as measured by application of the Tremaine & Weinberg (TW) method. As the method requires that the tracer satisfies the continuity equation, it has been applied largely to early-type barred galaxies. We show using numerical simulations of barred galaxies that dust attenuation factors typically found in these systems change the observed bar pattern speed by 20-40%. We also address the effect of star formation on the TW method and find that it does not change the results significantly. This suggests that applications of the TW method can be extended to include barred galaxies covering the full range of Hubble type.

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