Characterization and Removal of Galactic Dust Foreground from Measurements of the Polarization of the Cosmic Microwave Background Radiation

宇宙微波背景辐射偏振测量中银河尘埃前景的表征和去除

• 批准号: 0944513
• 负责人: Shaul Hanany
• 金额: $ 42.43万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-01-15 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944513&HistoricalAwards=false
• 关键词: Characterization; Removal; Galactic; Dust; Foreground

The proposal seeks funding to begin a research effort on characterizing and extracting galactic dust emissions from the data that will be collected by the NASA-funded Antarctic Long Duration Balloon-borne (LDB) ?E and B Experiment? (EBEX). A leading cosmological paradigm for the beginning and evolution of the Universe posits a period of Inflation shortly after the Big Bang. Inflation generated primordial gravitational waves in the Universe that imprinted a distinct signature called the "B-mode signal" on the polarization of the Cosmic Microwave Background (CMB) radiation. This signal is extremely weak, around 100 microKelvins or smaller, and astrophysical foregrounds such as polarized emission from galactic dust and synchrotron radiation swamp the Inflationary signal over most of the sky. The EBEX balloon payload will have the sensitivity to detect the B-mode signal if it is stronger than 1/10 of the current theoretical upper limit. The balloon observations will be carried out in frequency bands between 150 and 410 GHz. The higher end of this band is not accessible from the ground; thus, EBEX can provide valuable information on the properties of galactic dust emissions. This information is critical for all the CMB experiments searching for the Inflationary signal. EBEX is currently awaiting its flight from Antarctica in the austral summer of 2010/2011. The requested funds will be used to support a post-doctoral fellow and a graduate student to work on the characterization and extraction of galactic dust foregrounds from the EBEX data.

该提案寻求资金开始研究，以从NASA资助的南极长持续时间持续时间气囊（LDB）（LDB）和B实验中收集的数据来表征和提取银河尘埃排放？ （EBEX）。大爆炸后不久，宇宙的开始和演变的主要宇宙学范式提出了一段时期的通货膨胀。通货膨胀在宇宙中产生了原始引力波，在宇宙微波背景（CMB）辐射的极化上印有一个称为“ B模式信号”的独特签名。该信号极为弱，大约100个微蛋白或较小的信号，以及天体物理的前景，例如来自银河粉尘和同步辐射的偏振发射，大部分天空上的通货膨胀信号。 EBEX气球有效载荷将具有检测B模式信号的敏感性，如果其强于当前理论上限的1/10。气球观测将以150至410 GHz之间的频段进行。该乐队的高端无法从地面访问。因此，EBEX可以提供有关银河尘埃排放特性的有价值信息。此信息对于所有搜索通货膨胀信号的CMB实验至关重要。 EBEX目前正在等待2010/2011年澳大利亚夏季从南极洲飞行的航班。所请求的资金将用于支持博士后研究员和研究生，从而从EBEX数据中研究银河尘埃前景的表征和提取。