论文标题
用弥漫性星际带绘制局部星际介质
Mapping Local Interstellar Medium With Diffuse Interstellar Bands
论文作者
论文摘要
通过使用档案数据的数据，我们研究了四个漫射式插入带（4430 $Å$，5780 $Å$，5797 $Å$，6284 $Å$）的等效宽度之间的相关性与目标星的属性（颜色多余的值，相差和银色均值）。生产了许多不同的漫射星际带及其图的图，并进一步分析。对于Galactic $ x $ - 坐标，似乎有5780 $ dib（和6284 $Å$ dib）的等效宽度的结构。该结构定义在$ \ sim150 $ m $Å$和$ | x | <250 $ pc之内，达到$ x = 170 $ pc。我们认为，这种结构的起源不是统计波动。将数据中的数据分成几个子区域可改善或降低等效宽度与颜色过剩之间的众所周知的线性关系，这是可以预期的。但是，某些视线表现出截然不同的行为。 $ 150^\ circ <l <200^\ circ $内的区域显示在相关图中与所有相关系数$ \ textrm {r} <0.58 $的四个频段的颜色过剩。我们怀疑附近分子云中物理条件的变化可能是造成的。最后，该面积$ 250^\ Circ <l <300^\ Circ $显示（从统计学的角度来看）的等效宽度值明显低于其他区域的值 - 这告诉我们，这告诉我们，载流子（与其他区域相比）要么有明显的承运人（与其他地区相比），要么必须是仪器偏见的结果。
With the use of the data from archives, we studied the correlations between the equivalent widths of four diffuse interstellar bands (4430$Å$, 5780$Å$, 5797$Å$, 6284$Å$) and properties of the target stars (colour excess values, distances and Galactic coordinates). Many different plots of the diffuse interstellar bands and their maps were produced and further analysed. There appears to be a structure in the plot of equivalent widths of 5780$Å$ DIB (and 6284$Å$ DIB) against the Galactic $x$-coordinate. The structure is well defined below $\sim150$ m$Å$ and within $|x|<250$ pc, peaking around $x=170$ pc. We argue that the origin of this structure is not a statistical fluctuation. Splitting the data in the Galactic longitude into several subregions improves or lowers the well known linear relation between the equivalent widths and the colour excess, which was expected. However, some of the lines of sight display drastically different behaviour. The region within $150^\circ<l<200^\circ$ shows scatter in the correlation plots with the colour excess for all of the four bands with correlation coefficients $\textrm{R}<0.58$. We suspect that the variation of physical conditions in the nearby molecular clouds could be responsible. Finally, the area $250^\circ<l<300^\circ$ displays (from the statistical point of view) significantly lower values of equivalent widths than the other regions -- this tells us that there is either a significant underabundance of carriers (when compared with the other regions) or that this has to be a result of an observational bias.
