800秒差距内星际连续远紫外场的分布图
Map of the Interstellar Continuum FUV Field within 800 Parsecs
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中文总结 AI 辅助
该研究绘制了地球周围800秒差距内的恒星FUV场分布图，明确了FUV强度与气体密度、光谱硬度的关系，相关数据可供下载用于星际介质研究。
中文摘要 AI 辅助
由能量介于6至13.6电子伏特的光子构成的远紫外（FUV）场，在星际介质的化学与热力学演化中发挥着重要作用。FUV连续辐射由银河系中的亮恒星产生，并被星际尘埃吸收。我们利用最新获取的尘埃分布地图，结合恒星位置与光谱的星表，绘制出了地球周围800秒差距范围内恒星FUV场的分布图。该地图显示，太阳邻域的总FUV强度与现有测量结果一致（为Draine场的0.7倍），但存在显著的逐点波动。在银道面附近，FUV强度随气体密度的增加而降低，直至密度达到约10个氢原子每立方厘米，这是由于尘埃对光的吸收所致；当密度处于10至50个氢原子每立方厘米之间时，UV场再次升高，原因是高密度气体与年轻炽热恒星存在正相关。我们发现，UV场强度越高的区域，其光谱通常越硬；而尘埃消光更显著的区域，光谱则更软。所得地图及我们推导的恒星属性星表，均可供下载，以供研究人员研究邻近的星际介质区域。
英文摘要
The far-ultraviolet (FUV) field, consisting of photons with energies between 6 and 13.6 electron volts, plays an important role in the chemical and thermodynamical evolution of the interstellar medium. FUV continuum radiation is produced by bright stars in the galaxy and absorbed by interstellar dust. We used newly available maps of the dust distribution, in conjunction with catalogs of stellar positions and spectra, to create a map of the stellar FUV field within 800 parsecs of the Earth. The map shows a total FUV intensity in the solar neighborhood in line with existing measurements (0.7 times the Draine field), but substantial point-to-point fluctuations exist. Near the Galactic midplane, the FUV intensity decreases with increasing gas density up to a density of approximately 10 hydrogen atoms per cm$^3$, due to absorption of light by dust. Between 10 and 50 hydrogen atoms per cm$^3$ the UV field increases again, due to a positive correlation between high density gas and young hot stars. We find that the spectrum is generally harder where the UV field is higher, and softer in regions where dust extinction is more important. The resulting map, as well as our catalog of derived stellar properties, are both available for download for those wishing to study a nearby region of the ISM.
