RadioForegrounds+: Unveiling the complexity of radio foregrounds for the detectability of the CMB polarization B-mode

RadioForegrounds：揭示无线电前景的复杂性，以实现 CMB 极化 B 模式的可检测性

• 批准号: 10101603
• 金额: $ 21.42万
• 依托单位: UNIVERSITY OF OXFORD
• 依托单位国家: 英国
• 项目类别: EU-Funded
• 财政年份: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=10101603
• 关键词: RadioForegrounds+; Unveiling; complexity; radio; foregrounds

One of the main challenges in Cosmology is the detection of the primordial B-mode of CMB polarization, which would constitute a confirmation of the inflationary period of the Universe. However, the presence of different contaminants, mainly coming from the emissions of our own Galaxy, constitutes one of the major limiting factors to constrain reliably the existence of the B-modes. Indeed, the success of future CMB polarization experiments lies in the improved understanding and removal capability of foreground emissions. RadioForegrounds+ will provide a state-of-the art description of the highly complex properties of the polarised radio emission from our Galaxy, in particular the synchrotron and the anomalous microwave emissions, as well as of the population of radio sources. It will also provide an unprecedentedly thorough description of the intensity signal. This goal can only be achieved by combining the ESA’s Planck satellite maps (30-857GHz) with the unique low frequency experiments considered in this proposal: QUIJOTE (10-40 GHz), C-BASS (5 GHz) and S-PASS (2.3 GHz), by counting within the consortium with experts on the previous data sets (including the teams responsible for QUIJOTE and C-BASS) and by using the most advanced analysis techniques. The combination of these datasets will provide highlevel data products, that will range from more complete radio catalogues, including fainter sources and additional frequency coverage, to new component separated maps in wider regions of the sky. These new data products and models will be made available to the scientific community through widely-used platforms, increasing the scientific return and the impact of the project. We will also provide forecasts of the impact of radio foregrounds on the detectability of the B-mode of polarization for future CMB experiments. The resulting analyses will play a key role in preparing and supporting future international CMB missions as LiteBIRD or ground-based efforts as CMB-S4.

宇宙学的主要挑战之一是探测 CMB 偏振的原始 B 模式，这将证实宇宙的暴胀周期，然而，不同污染物的存在，主要来自我们银河系的排放。 ，构成可靠地限制 B 模式存在的主要限制因素之一。事实上，未来 CMB 偏振实验的成功在于提高对前景发射的理解和消除能力。它将提供对我们银河系偏振无线电发射的高度复杂特性的最先进的描述，特别是同步加速器和异常微波发射，以及无线电源的数量，它还将提供前所未有的信息。这一目标只能通过将 ESA 的普朗克卫星地图 (30-857GHz) 与本提案中考虑的独特低频实验相结合来实现：QUIJOTE (10-40 GHz)， C-BASS (5 GHz) 和 S-PASS (2.3 GHz)，通过与先前数据集的专家（包括负责 QUIJOTE 和 C-BASS 的团队）合作并使用最先进的分析技术组合。这些数据集将提供高级数据产品，范围从更完整的无线电目录（包括更微弱的源和额外的分离频率覆盖范围）到更广泛的天空区域的新组件地图。这些新的数据产品和模型将可供使用。我们还将通过广泛使用的平台向科学界提供有关无线电前景对 B 模式偏振可探测性影响的预测，从而提高项目的科学回报和影响。在准备和支持未来国际 CMB 任务（如 LiteBIRD）或地面工作（如 CMB-S4）方面发挥关键作用。