A Search for Dust Clouds near the Solar System with the Wilkinson Microwave Anisotropy Probe

用威尔金森微波各向异性探测器搜索太阳系附近的尘埃云

• 批准号: 69220156
• 负责人: Professor Dr. Dominik Schwarz, Ph.D.
• 金额: --
• 依托单位: Max-Planck-Institut für Sonnensystemforschung (MPS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/69220156?language=en
• 关键词: Search; Dust; Clouds; near; Solar

The Wilkinson Microwave Anisotropy Probe (WMAP) has built a map of the celestial sphere at millimetre wavelengths. Designed to characterize the fluctuations of the cosmic microwave background (CMB) radiation, WMAP is also sensitive to many foreground sources, e.g. the thermal emission from cosmic dust. Dedicated models were constructed to remove the emission by galactic dust from the observations. Some other foregrounds, however, may have stayed unaccounted. Moreover, the WMAP data suggest that an unaccounted bias is likely, revealed by the low power and suspicious alignment mutually and with the solar-system geometry of the quadrupole and octopole moments of the multipole expansion of the CMB fluctuations. Thus the goal of the proposed project is to search the WMAP data for local sources of microwave radiation and to put constraints on dust clouds in the vicinity of the Solar system in a new wavelength range. The project might also help to resolve the mysterious alignment of the low-order multipoles, and thus have important cosmological repercussions.

威尔金森微波各向异性探测器（WMAP）已经建立了一个在毫米波长的天球地图。WMAP的设计是为了描述宇宙微波背景辐射的波动，它对许多前景源也很敏感，例如宇宙尘埃的热辐射。建立了专门的模型，以消除观测中的银河尘埃发射。然而，其他一些前景可能仍然下落不明。此外，WMAP的数据表明，一个不明的偏见是可能的，揭示了低功率和可疑的相互对齐，并与太阳系统的几何形状的四极和八极矩的多极膨胀的CMB波动。因此，拟议项目的目标是在WMAP数据中寻找当地的微波辐射源，并在新的波长范围内对太阳系附近的尘埃云进行限制。该项目还可能有助于解决低阶多极子的神秘排列，从而产生重要的宇宙学影响。