宇宙光学背景：先锋10/11观测
Cosmic Optical Background: the View from Pioneer 10/11
摘要：
我们提出了新的限制宇宙光学背景（COB）从先锋10/11成像光偏振计（IPP）的数据分析。在仔细检查数据质量后，将不受黄道光影响的可用测量值整合到蓝色（~0.44 um）和红色（~0.64 um）波段的天空图中。精确的星光扣除是通过参考全天星表和银河系恒星星族的合成模型下降到32.0马格。我们发现，剩余的光被分成两个分量：一个分量显示出一个明确的相关性与热100 μ m的亮度，而另一个背叛了一个恒定的水平，在最低的100 μ m的亮度区域。在考虑了银河系中所有的不确定性和可能的残留光之后，第二个分量的存在是重要的，因此它最有可能具有河外起源（即，COB）。导出的COB亮度为（1.8 +/- 0.9）x 10^（-9）和（1.2 +/- 0.9）x 10^（-9）erg/s/cm 2/sr/A，分别为7.9 +/- 4.0和7.7 +/- 5.8 nW/m2/sr。我们的结论是，COB的大部分是由正常的星系，已经解决了目前最深的观测。在这些波长下，似乎没有多少空间让其他星族做出贡献，包括“第一颗恒星”。另一方面，IPP剩余光的第一个分量代表了银河系漫射光（DGL）--被星际尘埃散射的星光。我们得到这两个波段的平均DGL与100 μ m的亮度比分别为2.1 × 10^（-3）和4.6 × 10^（-3），这与以前对密集尘埃区的观测结果大致一致。扩散星际介质中的扩展红光发射也得到了证实。
英文摘要：
We present the new constraints on the cosmic optical background (COB) obtained from an analysis of the Pioneer 10/11 Imaging Photopolarimeter (IPP) data. After careful examination of data quality, the usable measurements free from the zodiacal light are integrated into sky maps at the blue (~0.44 um) and red (~0.64 um) bands. Accurate starlight subtraction is achieved by referring to all-sky star catalogs and a Galactic stellar population synthesis model down to 32.0 mag. We find that the residual light is separated into two components: one component shows a clear correlation with thermal 100 um brightness, while another betrays a constant level in the lowest 100 um brightness region. Presence of the second component is significant after all the uncertainties and possible residual light in the Galaxy are taken into account, thus it most likely has the extragalactic origin (i.e., the COB). The derived COB brightness is (1.8 +/- 0.9) x 10^(-9) and (1.2 +/- 0.9) x 10^(-9) erg/s/cm2/sr/A at the blue and red band, respectively, or 7.9 +/- 4.0 and 7.7 +/- 5.8 nW/m2/sr. Based on a comparison with the integrated brightness of galaxies, we conclude that the bulk of the COB is comprised of normal galaxies which have already been resolved by the current deepest observations. There seems to be little room for contributions of other populations including "first stars" at these wavelengths. On the other hand, the first component of the IPP residual light represents the diffuse Galactic light (DGL) - scattered starlight by the interstellar dust. We derive the mean DGL-to-100 um brightness ratios of 2.1 x 10^(-3) and 4.6 x 10^(-3) at the two bands, which are roughly consistent with the previous observations toward denser dust regions. Extended red emission in the diffuse interstellar medium is also confirmed.
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