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arXiv 1608.05342astro-ph.GA
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星暴驱动的星系风的标度关系

Scaling Relations of Starburst-Driven Galactic Winds

Ryan Tanner, Gerald Cecil, Fabian Heitsch

摘要:

使用合成吸收线产生的三维流体动力学模拟,我们探讨了如何与恒星形成率(SFR)和SFR密度的恒星爆发驱动的星系风的速度。我们发现强烈的相关性,直到缩放关系突然变平在一个点设置的质量负荷的恒星暴。在这一点以下,标度关系取决于由吸收线探测的温度状态,而不是质量负载。精确的比例关系取决于是否使用吸收线的最大速度或平均速度。我们发现中性气体的流出速度比最热气体的平均速度低四到五倍,中性气体和电离气体之间的速度差随着气体电离而增加。因此,中性或低电离气体的吸收线将低估热气体的流出速度,严重低估流出能量。

英文摘要:

Using synthetic absorption lines generated from 3D hydro-dynamical simulations we explore how the velocity of a starburst-driven galactic wind correlates with the star formation rate (SFR) and SFR density. We find strong correlations until the scaling relations flatten abruptly at a point set by the mass loading of the starburst. Below this point the scaling relation depends on the temperature regime being probed by the absorption line, not on the mass loading. The exact scaling relation depends on whether the maximum or mean velocity of the absorption line is used. We find that the outflow velocity of neutral gas is four to five times lower than the average velocity of the hottest gas, with the difference in velocity between the neutral and ionized gas increasing with gas ionization. Thus, absorption lines of neutral or low ionized gas will underestimate the outflow velocity of hot gas, severely underestimating outflow energetics.

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