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arXiv 1103.2124astro-ph.CO
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阿塔卡玛宇宙望远镜对宇宙微波背景透镜功率谱的探测

Detection of the Power Spectrum of Cosmic Microwave Background Lensing by the Atacama Cosmology Telescope

Sudeep Das, Blake D. Sherwin, Paula Aguirre, John W. Appel, J. Richard Bond, C. Sofia Carvalho, Mark J. Devlin, Joanna Dunkley, Rolando Dunner, Thomas Essinger-… 展开作者

Sudeep Das, Blake D. Sherwin, Paula Aguirre, John W. Appel, J. Richard Bond, C. Sofia Carvalho, Mark J. Devlin, Joanna Dunkley, Rolando Dunner, Thomas Essinger-Hileman, Joseph W. Fowler, Amir Hajian, Mark Halpern, Matthew Hasselfield, Adam D. Hincks, Renee Hlozek, Kevin M. Huffenberger, John P. Hughes, Kent D. Irwin, Jeff Klein, Arthur Kosowsky, Robert H. Lupton, Tobias A. Marriage, Danica Marsden, Felipe Menanteau, Kavilan Moodley, Michael D. Niemack, Michael R. Nolta, Lyman A. Page, Lucas Parker, Erik D. Reese, Benjamin L. Schmitt, Neelima Sehgal, Jon Sievers, David N. Spergel, Suzanne T. Staggs, Daniel S. Swetz, Eric R. Switzer, Robert Thornton, Katerina Visnjic, Ed Wollack

摘要:

通过测量阿塔卡玛宇宙望远镜温度图中的四点关联函数,首次发现了宇宙微波背景的引力透镜效应。我们通过计算潜在污染物的水平和执行一些无效测试来验证我们的检测。由此产生的收敛功率谱在2度角尺度测量的振幅的物质密度波动的共动长度尺度约为100兆秒差距在红移约0.5至3。测得的信号幅度与Lambda冷暗物质宇宙学的预测一致。由于会聚功率谱的幅度按密度波动幅度的平方缩放,因此透镜化信号的4-西格玛检测测量到密度波动的幅度为12%。

英文摘要:

We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating the levels of potential contaminants and performing a number of null tests. The resulting convergence power spectrum at 2-degree angular scales measures the amplitude of matter density fluctuations on comoving length scales of around 100 Mpc at redshifts around 0.5 to 3. The measured amplitude of the signal agrees with Lambda Cold Dark Matter cosmology predictions. Since the amplitude of the convergence power spectrum scales as the square of the amplitude of the density fluctuations, the 4-sigma detection of the lensing signal measures the amplitude of density fluctuations to 12%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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