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Far-ultraviolet Observations Of The Ophiuchus Region With Spear

机译：带矛的蛇夫部位的远紫外线观察

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摘要

We present the first far-ultraviolet (FUV; 1370-1670 A) image of the Ophiuchus molecular cloud region, observed with the SPEAR imaging spectrograph. The flux levels of the diffuse FUV continuum are in reasonable agreement with those of the Voyager observations in the shorter FUV wavelengths (912-1216 A), provided that the diffuse FUV emission is dominated by the spectra from late O- and early B-type stars. The observed region of the present study was divided into five subregions according to their FUV intensities, and the spectrum was obtained for each subregion with prominent H_2 fluorescent emission lines. A synthetic model of the H_2 fluorescent emission indicates that the molecular cloud has more or less uniform physical parameters over the Ophiuchus region, with a hydrogen density n_H of 500 cm~(-3) and a H_2 column density N(H_2) of 2 × 10~(20) cm~(-2). It is notable that the observed diffuse FUV continuum is well reproduced by a single-scattering model with scattered starlight from the dust cloud located at ～ 120-130 pc, except at a couple of regions with high optical depth. The model also gives reasonable properties of the dust grains of the cloud with an albedo a of 0.36 ± 0.20 and a phase function asymmetry factor g of 0.52 ± 0.22.
机译：我们提出了用SPEAR成像光谱仪观察到的蛇夫子分子云区域的第一个远紫外线（FUV; 1370-1670 A）图像。漫射FUV连续谱的通量水平与Voyager观测值在较短的FUV波长（912-1216 A）中的通量水平合理吻合，但前提是漫射FUV的发射主要来自晚期O型和早期B型光谱星。本研究的观察区域根据其FUV强度分为五个子区域，并获得了每个具有突出的H_2荧光发射线的子区域的光谱。 H_2荧光发射的合成模型表明分子云在蛇夫座区域具有或多或少的均匀物理参数，氢密度n_H为500 cm〜（-3），H_2柱密度N（H_2）为2× 10〜（20）厘米〜（-2）。值得注意的是，所观察到的漫射FUV连续谱是通过单散射模型很好地重现的，该散射模型由位于〜120-130 pc处的尘埃云散布了星光，但在几个光学深度较高的区域除外。该模型还给出了云尘粒的合理特性，其反照率a为0.36±0.20，相位函数不对称因子g为0.52±0.22。

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