论文标题
恒星形成的特征尺度。 I.局部尺度上的团块形成效率
Characteristic scale of star formation. I. Clump formation efficiency on local scales
论文作者
论文摘要
We have used the ratio of column densities (CDR) derived independently from the 850-$μ$m continuum JCMT Plane Survey (JPS) and the $^{13}$CO/C$^{18}$O $(J=3-2)$ Heterodyne Inner Milky Way Plane Survey (CHIMPS) to produce maps of the dense-gas mass fraction (DGMF) in two slices of the Galactic Plane centred在$ \ ell $ = 30 $^{\ circ} $和$ \ ell $ = 40 $^{\ circ} $。观察到的DGMF是分子气体中瞬时结块形成效率（CFE）的度量。我们将两个磁场分为对应于交叉的螺旋臂的速度成分，对螺旋臂DGMF地图进行二维功率光谱分析显示，在分子云的近似尺寸尺度上，斜坡上有一个破裂。我们将其解释为CFE变化幅度幅度的特征量表，也是对调节CFE的主要机制的限制，因此，共同追踪的云中的恒星形成效率。
We have used the ratio of column densities (CDR) derived independently from the 850-$μ$m continuum JCMT Plane Survey (JPS) and the $^{13}$CO/C$^{18}$O $(J=3-2)$ Heterodyne Inner Milky Way Plane Survey (CHIMPS) to produce maps of the dense-gas mass fraction (DGMF) in two slices of the Galactic Plane centred at $\ell$=30$^{\circ}$ and $\ell$=40$^{\circ}$. The observed DGMF is a metric for the instantaneous clump-formation efficiency (CFE) in the molecular gas. We split the two fields into velocity components corresponding to the spiral arms that cross them, and a two-dimensional power-spectrum analysis of the spiral arm DGMF maps reveals a break in slope at the approximate size scale of molecular clouds. We interpret this as the characteristic scale of the amplitude of variations in the CFE and a constraint on the dominant mechanism regulating the CFE and, hence, the star-formation efficiency in CO-traced clouds.
