论文标题
[oi]6300Å$ \，$排放作为探针的探针
[OI] 6300Å$\,$ emission as a probe of external photoevaporation of protoplanetary discs
论文作者
论文摘要
我们研究了[OI] 6300 $ \ MATHRING {\ MATHRM A} $禁止线的实用程序，用于在不同的环境和一系列距离内识别和解释外部驱动的光蒸发风。热兴奋[OI] 6300 $ \ MATHRING {\ MATHRM A} $是众所周知的内盘风示踪剂，因此任何外部贡献都需要区分。在外风中，该线并非热兴奋，而是由OH解离引起的，我们研究了该过程尺度如何用圆盘/环境参数产生的线。我们发现，线条发光度急剧增加，而FUV辐射场强度高于5000 g $ _0 $。来自我们模型的预测亮度与猎户座星云群中推定线的线光度的测量一致。仅在较强的紫外线环境中，高亮度就可以作为诊断性，但是预计[OI] - 核酸到胶合发光比的升高可以更好地分开这两个贡献。这可以提供一种识别遥远簇中外部光蒸发的方法，在这种群集中，蒸发圆盘的预先形态无法在空间上解决。
We study the utility of the [OI] 6300$\mathring{\mathrm A}$ forbidden line for identifying and interpreting externally driven photoevaporative winds in different environments and at a range of distances. Thermally excited [OI] 6300$\mathring{\mathrm A}$ is a well known tracer of inner disc winds, so any external contribution needs to be distinguishable. In external winds, the line is not thermally excited and instead results from the dissociation of OH and we study how the line luminosity resulting from that process scales with the disc/environmental parameters. We find that the line luminosity increases dramatically with FUV radiation field strength above around 5000 G$_0$. The predicted luminosities from our models are consistent with measurements of the line luminosity of proplyds in the Orion Nebula Cluster. The high luminosity in strong UV environments alone may act as a diagnostic, but a rise in the [OI]-to-accretion luminosity ratio is predicted to better separate the two contributions. This could provide a means of identifying external photoevaporation in distant clusters where the proplyd morphology of evaporating discs cannot be spatially resolved.
