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DETECTING THE ABERRATION OF THE COSMIC MICROWAVE BACKGROUND

机译:检测宇宙微波的像差背景

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摘要

The motion of the solar system barycenter with respect to the cosmic microwave background (CMB) induces a very large apparent dipole component into the CMB brightness map at the 3 mK level. In this Letter, we discuss another kinematic effect of our motion through the CMB: the small shift in apparent angular positions due to the aberration of light. The aberration angles are only of order β approx= 0.001, but this leads to a potentially measurable compression (expansion) of the spatial scale in the hemisphere toward (away from) our motion through the CMB. In turn, this will shift the peaks in the acoustic power spectrum of the CMB by a factor of order 1 ± β. For current CMB missions, and even those in the foreseeable future, this effect is small but should be taken into account. In principle, if the acoustic peak locations were not limited by sampling noise (i.e., the cosmic variance), this effect could be used to determine the cosmic contribution to the dipole term.
机译:太阳系重心相对于宇宙微波背景(CMB)的运动在3 mK的水平上将非常大的表观偶极子分量引入CMB亮度图中。在这封信中,我们讨论了通过CMB进行运动的另一种运动学效果:由于光像差导致的视在角位置上的微小变化。像差角仅为β大约= 0.001的量级,但是这导致半球中的空间尺度朝着(远离)我们通过CMB的运动潜在地可测量的压缩(扩展)。反过来,这将使CMB的声功率谱中的峰移动1±β数量级。对于当前的CMB任务,甚至是在可预见的将来的任务,这种影响很小,但应予以考虑。原则上,如果声峰位置不受采样噪声(即宇宙方差)的限制,则可以使用此效应来确定宇宙对偶极子项的贡献。

著录项

  • 来源
    《The Astrophysical journal》 |2006年第1pt2期|p.L1-L4|共4页
  • 作者

    S. BURLES; S. RAPPAPORT;

  • 作者单位

    Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

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