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How to generate outflows

机译:如何产生流出

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Outflows are probably generated by young stars inside galaxies. Computer simulations of the formation of galaxies would therefore ideally resolve costnological large-scale structure (over tens of megaparsecs) down to the scale of individual stars (at least 10~(14) times smaller). This is, and seems certain to remain, unfeasible. The line of attaek is instead to mimic the effects of stars without actually resolving them individually. Because star formation is the conclusion of runaway gas cooling and collapse, a typical computational approach is to form stars when gas satisfies certain averaged conditions, and in particular when it reaches a threshold density. As resolution slowly improves in simulations, smaller regions and larger densities can be self-consistently resolved. Until the mid-2000s' a typical threshold density was set at 0.1mH cm~(-3), where mH is the mass of a hydrogen atom. This corresponds to the mean density of galactic neutral atomic gas, so stars form throughout the disk of a simulated galaxy. Energy output from stars in the diffuse medium results in a gentle heating of the entire galaxy, slowing the process of further star formation.
机译:外流可能是由星系内部的年轻恒星产生的。因此,计算机模拟星系的形成将理想地解决造币术的大规模结构(超过几十兆帕秒)到单个恒星的规模(至少小10到14倍)。这是可行的,而且似乎可以肯定仍然存在。 attaek的思路是模仿星的效果,而无需实际单独解决它们。因为恒星的形成是逃逸的气体冷却和坍塌的结果,所以典型的计算方法是在气体满足某些平均条件时,尤其是当其达到阈值密度时,形成恒星。随着模拟中分辨率的缓慢提高,可以自洽地解决较小区域和较大密度的问题。直到2000年代中期,典型的阈值密度被设置为0.1mH cm〜(-3),其中mH是氢原子的质量。这对应于银河系中性原子气体的平均密度,因此在整个模拟银河系的整个圆盘中都会形成恒星。来自弥散介质中恒星的能量输出导致整个星系的缓慢加热,从而减慢了进一步形成恒星的过程。

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  • 来源
    《Nature》 |2014年第7487期|175-175|共1页
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  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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