发表机构
HUN-REN CSFK Konkoly Observatory; MTA Centre of Excellence; ELTE Eötvös Loránd University; Institute of Physics and Astronomy; Max-Planck-Institut für extraterrestrische Physik; Instituto de Astrofísica de Canarias (IAC); Departamento de Astrofísica, Universidad de La Laguna; European Space Agency – ESRIN; Université Côte d’Azur; Observatoire de la Côte d’Azur; CNRS; Laboratoire Lagrange; School of Physics and Astronomy, University of Leicester; Department of Physics, University of Helsinki; Institute of Space Science (ISS) - INFLPR subsidiary（匈牙利科学院天文研究所孔科利观测站; 匈牙利科学院卓越中心; 厄特沃什·罗兰大学; 物理与天文学研究所; 马克斯·普朗克地外物理研究所; 加那利群岛天体物理学研究所; 拉帕尔马大学天体物理学系; 欧洲空间局埃斯林研究中心; 蔚蓝海岸大学; 蔚蓝海岸天文台; 法国国家科学研究中心; 拉格朗日实验室; 莱斯特大学物理与天文学院; 赫尔辛基大学物理系; 太空科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究评估黄道背景模型在小太阳距角下的可靠性，发现基于单色亮度变化的模型优于结合颜色信息的模型，但小距角黄道辐射仍受弱约束，需新中红外观测改进背景估计。
AI 中文摘要
目前的黄道光（可见光波段行星际尘埃散射的太阳光）和黄道辐射（中红外波段的热辐射）模型主要受限于在相对较大的太阳距角（e >~ 60度）下获得的表面亮度测量。因此，它们在较小距角下的预测精度仍不确定。这对于e ~ 30-60度的太阳距角尤为重要，因为下一代近地天体发现任务如NEO Surveyor和NEOMIR正是设计在此范围内运行。为了评估这些模型在小太阳距角下的可靠性，我们汇编并重新分析了现有的小距角黄道光和黄道辐射测量数据，并首次在现代黄道光模型从未被独立测试过的范围内对其进行了系统验证。我们比较了源自COBE/DIRBE巡天的两个模型：一个主要受单色天空亮度的空间和时间变化约束，另一个额外使用波段间颜色信息，并通过要求25um处高纬度残差最小化来固定绝对归一化。我们发现前者显著更好地再现了观测结果。在与红外近地天体巡天最相关的波长（8-10 um）处，它在e ~ 40-60度时通常与测量结果吻合在约10%以内。尽管它在e ~ 30度时也表现更好，但仍存在显著差异。这些结果表明，小太阳距角下的黄道辐射仍然仅受到弱约束，其绝对亮度仍不确定。需要新的中红外观测来改进未来红外巡天任务的背景估计。
英文摘要
Present models of the zodiacal light (scattered sunlight from interplanetary dust in the visible) and zodiacal emission (thermal emission in the mid-infrared) are primarily constrained by surface-brightness measurements obtained at relatively large solar elongations (e >~ 60 deg). As a result, their predictive accuracy at smaller elongations remains uncertain. This is particularly relevant for solar elongations of e ~ 30-60 deg, where next-generation near-Earth-object discovery missions such as NEO Surveyor and NEOMIR are designed to operate. To evaluate the reliability of these models at small solar elongations, we compile and reanalyze the available small-elongation zodiacal-light and zodiacal-emission measurements and provide the first systematic validation of modern zodiacal-light models in a regime where they have never been independently tested. We compare two models derived from the COBE/DIRBE survey: one constrained primarily by the spatial and temporal variation of the monochromatic sky brightness, and another that additionally uses interband color information and fixes the absolute normalization by requiring the minimum high-latitude residual at 25um to vanish. We find that the former reproduces the observations significantly better. At wavelengths most relevant to infrared near-Earth-object surveys (8-10 um), it typically agrees with measurements to within ~10% at e ~ 40-60 deg. Although it also performs better at e ~ 30 deg, significant discrepancies remain. These results show that zodiacal emission at small solar elongations is still only weakly constrained and that its absolute brightness remains uncertain. New mid-infrared observations are required to improve background estimates for future infrared survey missions.
CommentsAccepted for publication in the Publications of the Astronomical Society of the Pacific
