在高空间分辨率下对Sandage星云弥漫UV辐射的GALEX观测
GALEX Observations of Diffuse UV Radiation at High Spatial Resolution from the Sandage Nebulosity
摘要：
利用GALEX紫外成像仪，我们观测到了一个星云区域，Sandage（1976）首先将其确定为被星际尘埃散射的星光。除了气辉和黄道辐射外，我们还发现在\galex FUV（1350 - 1750毫微米）和NUV（1750 - 2850毫微米）中有一个500至800 \phunit的漫射紫外背景。在这些辐射中，多达250个\phunit是由FUV波段的\htwo荧光辐射引起的;其余的则是来自星际尘埃的散射。我们已经估计出FUV中的光学常数为$a = 0.3; g = 0.7$，NUV中的光学常数为$a = 0.5; g = 0.7$，这意味着高度前向散射的颗粒，加上河外贡献高达150 \phunit。这是迄今为止对漫射紫外背景的最高空间分辨率观测，并显示出超出仪器噪声预期的内在散射。需要进一步的建模来理解这种分散的性质及其对ISM的影响。
英文摘要：
Using the GALEX ultraviolet imagers we have observed a region of nebulosity first identified as starlight scattered by interstellar dust by Sandage (1976). Apart from airglow and zodiacal emission, we have found a diffuse UV background of between 500 and 800 \phunit in both the \galex FUV (1350 -- 1750 Å) and NUV (1750 -- 2850 Å). Of this emission, up to 250 \phunit is due to \htwo fluorescent emission in the FUV band; the remainder is consistent with scattering from interstellar dust. We have estimated the optical constants to be $a = 0.3; g = 0.7$ in the FUV and $a = 0.5; g = 0.7$ in the NUV, implying highly forward scattering grains, plus an extragalactic contribution of as much as 150 \phunit. These are the highest spatial resolution observations of the diffuse UV background to date and show an intrinsic scatter beyond that expected from instrumental noise alone. Further modeling is required to understand the nature of this scatter and its implications for the ISM.
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