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

该提案寻求资金，以开始一项研究工作，从NASA资助的南极长时间气球(LDB)E和B实验收集的数据中表征和提取银河系尘埃排放。(EBEX)。宇宙起源和演化的一个领先的宇宙学范式假设在大爆炸后不久就有一段时间的膨胀。膨胀在宇宙中产生了原始引力波，在宇宙微波背景(CMB)辐射的偏振上留下了一个独特的标记，称为“B模信号”。这个信号非常微弱，大约100微开尔文或更小，天体物理前景，如来自星系尘埃和同步辐射的极化发射，淹没了大部分天空中的膨胀信号。EBEX气球有效载荷将具有检测B模式信号的灵敏度，如果它强于当前理论上限的1/10。气球观测将在150至410 GHz的频段内进行。这个波段的较高端不能从地面到达；因此，EBEX可以提供关于星系尘埃排放特性的有价值的信息。这一信息对于CMB所有寻找通胀信号的实验都是至关重要的。EBEX目前正在等待2010/2011年南半球夏季从南极洲起飞。申请的资金将用于支持一名博士后研究员和一名研究生从EBEX数据中确定和提取星系尘埃前景的工作。

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.