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首页> 外文期刊>The Astrophysical journal >FAR ULTRAVIOLET SPECTROSCOPIC EXPLORER OBSERVATIONS OF MOLECULAR HYDROGEN IN TRANSLUCENT INTERSTELLAR CLOUDS: THE LINE OF SIGHT TOWARD HD 73882
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FAR ULTRAVIOLET SPECTROSCOPIC EXPLORER OBSERVATIONS OF MOLECULAR HYDROGEN IN TRANSLUCENT INTERSTELLAR CLOUDS: THE LINE OF SIGHT TOWARD HD 73882

机译：半透明星际云中分子氢的远紫外光谱探索者观测：向HD 73882的视线

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摘要

We report the results of the initial Far Ultraviolet Spectroscopic Explorer observations of molecular hydrogen (H_2) in translucent clouds. These clouds have greater optical depth than any of the diffuse clouds previously observed for far-UV H_2 absorption and provide new insights into the physics and chemistry of such regions. Our initial results involve observations of HD 73882, a well-studied southern hemisphere star lying behind substantial interstellar material (E_(B-V) = 0.72; A_V = 2.44). We find a total H_2 column density N(H_2) = 1.2 x 10~(21) cm~(-2) about 3 times larger than the values for diffuse clouds previously measured in the far-UV. The gas kinetic temperature indicated by the ratio N(J = 1)/N(J = 0)is58 ± 10 K. With the aid of ground-based data to calculate an appropriate multicomponent curve of growth, we have determined column densities for all rotational levels up to J = 7. The J ≥ 2 states can be reasonably fitted with a rotational excitation temperature of 307 ± 23 K. Both the kinetic and rotational temperatures are similar to those found in previous investigations of diffuse clouds. The ratios of carbonaceous molecules to hydrogen molecules are also similar to ratios in diffuse clouds, suggesting a similar chemistry for this line of sight.
机译：我们报告了半透明云中分子氢（H_2）的最初的远紫外光谱浏览器观察结果。这些云的光学深度比以前观察到的远紫外H_2吸收的任何弥散云都大，并为此类区域的物理和化学提供了新的见识。我们的初步结果涉及对HD 73882的观测，这是一颗经过充分研究的南半球恒星，位于大量星际物质后面（E_（B-V）= 0.72; A_V = 2.44）。我们发现总的H_2柱密度N（H_2）= 1.2 x 10〜（21）cm〜（-2），大约是先前在远紫外线下测得的弥散云值的3倍。气体动力学温度由N（J = 1）/ N（J = 0）之比表示为58±10K。借助基于地面的数据来计算合适的生长多曲线，我们已经确定了所有色谱柱的密度旋转水平最高可达到J =7。J≥2状态可以合理地与307±23 K的旋转激发温度相匹配。动力学和旋转温度均与先前对弥散云的研究相似。碳质分子与氢分子的比率也类似于弥散云中的比率，这表明该视线具有相似的化学性质。

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