A measurement of the large-scale cosmic microwave background anisotropy at 1. 8 millimeter wavelength
A measurement of the large-scale cosmic microwave background anisotropy at 1. 8 millimeter wavelength
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1. 8毫米波长大尺度宇宙微波背景各向异性的测量
DOI：
10.1086/185989
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
L. Page
中科院分区：
文献类型：
--
作者：
S. S. Meyer;E. Cheng;L. Page
这种测量的大尺度宇宙微波背景辐射（CMBR）各向异性的地方最严格的限制，迄今为止的波动在CMBR的角尺度大于约4度。利用一台工作在1.8、1.1、0.63和0.44毫米波段的四通道辐射热计，以3.8度的角分辨率绘制了北方半个地区的漫射天空亮度图。对银河系纬度为15度或更高的最长波长的天空图进行分析，得出CMBR在Delta T/T为1.6 x 10的-5次方时波动的95%置信度上限，相关角为13度时高斯波动的统计功效为92%。在3度和22度之间，波动的上限是4.0 x 10的-5次方。在地图中检测到各向异性，但它还不能归因于原始来源。对于高斯波动，该实验的最终灵敏度在该角度范围内为7 × 10 - 6。参考文献13篇。
This measurement of the large-scale cosmic microwave background radiation (CMBR) anisotropy places the most stringent constraints to date on fluctuations in the CMBR on angular scales greater than about 4 deg. Using a four-channel bolometric radiometer operating at 1.8, 1.1, 0.63, and 0.44 mm, the diffuse sky brightness over half of the northern hemisphere has been mapped with an angular resolution of 3.8 deg. Analysis of the sky map at the longest wavelength for Galactic latitudes of 15 deg or more yields a 95-percent confidence level upper limit on fluctuations of the CMBR at Delta T/T of 1.6 x 10 to the -5th with a statistical power of 92 percent for Gaussian fluctuations at a correlation angle of 13 deg. Between 3 deg and 22 deg, the upper limit of fluctuations is 4.0 x 10 to the -5th . An anisotropy is detected in the map, but it cannot yet be attributed to primordial sources. The ultimate sensitivity for this experiment is 7 x 10 to the -6th over this angular range for Gaussian fluctuations. 13 refs.