利用AKARI/FIS深场观测探测宇宙远红外背景
Detection of CFIRB with AKARI/FIS Deep Observations
AI总结：
本文通过混源分析和三种星系演化模型，评估AKARI/FIS深场观测探测宇宙远红外背景涨落的可行性，并提出最佳观测策略以区分星系演化情景。
摘要：
宇宙远红外背景（CFIRB）包含了有关贡献源的数量和分布的信息，因此为我们理解星系演化提供了重要线索。利用混源研究为观测设定基本极限，我们研究了利用AKARI/FIS深场观测探索CFIRB的潜力。远红外巡天仪（FIS）是AKARI（前称ASTRO-F）卫星上的焦平面仪器之一，该卫星于2006年初发射。基于假设三种不同宇宙学演化情景（无演化、弱演化和强演化）的源分布模型、红外卷云弥散发射的广泛模型以及仪器噪声估计，我们对深场远红外观测的混源水平确定进行了综合分析。我们利用推导出的灵敏度为AKARI/FIS任务探测CFIRB涨落提出最佳观测策略。如果源分布遵循演化模型，观测将主要受源混源限制。我们发现将能够探测到CFIRB涨落，并且这些涨落将反过来提供信息，以在大多数低至中等卷云区域区分星系的演化情景。
英文摘要：
The Cosmic Far-Infrared Background (CFIRB) contains information about the number and distribution of contributing sources and thus gives us an important key to understand the evolution of galaxies. Using a confusion study to set a fundamental limit to the observations, we investigate the potential to explore the CFIRB with AKARI/FIS deep observations. The Far-Infrared Surveyor (FIS) is one of the focal-plane instruments on the AKARI (formerly known as ASTRO-F) satellite, which was launched in early 2006. Based upon source distribution models assuming three different cosmological evolutionary scenarios (no evolution, weak evolution, and strong evolution), an extensive model for diffuse emission from infrared cirrus, and instrumental noise estimates, we present a comprehensive analysis for the determination of the confusion levels for deep far-infrared observations. We use our derived sensitivities to suggest the best observational strategy for the AKARI/FIS mission to detect the CFIRB fluctuations. If the source distribution follows the evolutionary models, observations will be mostly limited by source confusion. We find that we will be able to detect the CFIRB fluctuations and that these will in turn provide information to discriminate between the evolutionary scenarios of galaxies in most low-to-medium cirrus regions.
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