猎户座的酒吧：物理条件通过的H+ / H0 / H2接口
Orion's Bar: Physical Conditions across the Definitive H+ / H0 / H2 Interface
摘要：
先前的工作已经表明猎户座棒是电离气体和分子气体之间的界面，大致从边缘观察，它被来自梯形星团的光激发。任何恒星形成区的大部分辐射都来自这样的界面，因此Bar可以作为任何辐射模型的基础测试。在这里，我们结合X射线，光学，IR和无线电数据集，以获得沿过渡从H+到H 0到H2区域的发射光谱。然后，我们再现这些层的光谱与模拟，同时占详细的微观物理的气体，颗粒和分子，特别是H2和CO。的磁场，观察到的是占主导地位的压力在另一个地区的猎户座星云，被视为一个自由参数，随着宇宙射线的密度。我们的模型成功地解释了整个酒吧的光学，红外和无线电观测，包括一个显着的磁压，也加热了宇宙射线的密度过大，我们认为这是由于宇宙射线被困在压缩的磁场。正如我们之前在M17中所发现的那样，在猎户座酒吧中，来自新形成恒星的辐射和风所携带的动量会推回并压缩周围的气体。在星光中的向外动量和H+区域周围的原子和分子气体中的总压力之间存在一个粗略的平衡。如果气体开始时有一个弱的磁场，来自新形成的星系团的星光将推回气体，压缩气体、磁场和宇宙射线，直到磁压成为一个重要因素。
英文摘要：
Previous work has shown the Orion Bar to be an interface between ionized and molecular gas, viewed roughly edge on, which is excited by the light from the Trapezium cluster. Much of the emission from any star-forming region will originate from such interfaces, so the Bar serves as a foundation test of any emission model. Here we combine X-ray, optical, IR and radio data sets to derive emission spectra along the transition from H+ to H0 to H2 regions. We then reproduce the spectra of these layers with a simulation that simultaneously accounts for the detailed microphysics of the gas, the grains, and molecules, especially H2 and CO. The magnetic field, observed to be the dominant pressure in another region of the Orion Nebula, is treated as a free parameter, along with the density of cosmic rays. Our model successfully accounts for the optical, IR and radio observations across the Bar by including a significant magnetic pressure and also heating by an excess density of cosmic rays, which we suggest is due to cosmic rays being trapped in the compressed magnetic field. In the Orion Bar, as we had previously found in M17, momentum carried by radiation and winds from the newly formed stars pushes back and compresses the surrounding gas. There is a rough balance between outward momentum in starlight and the total pressure in atomic and molecular gas surrounding the H+ region. If the gas starts out with a weak magnetic field, the starlight from a newly formed cluster will push back the gas and compress the gas, magnetic field, and cosmic rays until magnetic pressure becomes an important factor.
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