论文标题
在事物星系中的湍流与恒星形成之间的相关性搜索
A Search for correlations between turbulence and star formation in THINGS galaxies
论文作者
论文摘要
来自星形形成的反馈的空间范围从parsec尺度上的分子云破坏到超壳和千杆尺度上的磁盘井喷不等。给出这些量表的相对能量和动量对于理解任何一个区域中恒星形成的终止以及整个星系中星际湍流和磁盘稳定性的起源很重要。在这里，我们测量了十一件事星系，与多余的星形形成区域相关的HI气体的过量动能，速度分散和表面密度，在观察到的局部值和方位角平均值之间的差异确定过量。我们发现多余的恒星形成速率密度区域中过量的动能和速度分散量的少量减少，这表明大多数反馈能不能进入局部HI运动。最有可能破坏分子云并在高气密度下快速消散。有些也可以分布在较大的区域上，填充恒星形成的峰之间的空间，并从自我重力和螺旋臂冲击中为其他能源做出贡献。
The spatial range for feedback from star formation varies from molecular cloud disruption on parsec scales to supershells and disk blowout on kiloparsec scales. The relative amounts of energy and momentum given to these scales is important for understanding the termination of star formation in any one region and the origin of interstellar turbulence and disk stability in galaxies as a whole. Here we measure for eleven THINGS galaxies the excess kinetic energy, velocity dispersion and surface density of HI gas associated with regions of excess star formation, where the excess is determined from the difference between the observed local value and the azimuthal average. We find small decreases in the excess kinetic energy and velocity dispersion in regions of excess star formation rate density, suggesting that most of the feedback energy does not go into local HI motion. Most likely it disrupts molecular clouds and dissipates rapidly at high gas density. Some could also be distributed over larger regions, filling in spaces between the peaks of star formation and contributing to other energy sources from self-gravity and spiral arm shocks.
