A high resolution measurement of temperature anisotropies in the cosmic microwave background radiation with the complete ACBAR data set
A high resolution measurement of temperature anisotropies in the cosmic microwave background radiation with the complete ACBAR data set
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使用完整的 ACBAR 数据集对宇宙微波背景辐射中的温度各向异性进行高分辨率测量
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发表时间：
2008
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通讯作者：
C. Reichardt
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作者：
C. Reichardt
Arcminute宇宙辐射热计阵列接收器（ACBAR）是一个16单元的蜘蛛网辐射热计阵列，工作频率为150 GHz。ACBAR安装在2.1米的蝰蛇望远镜上，在南极进行了四年的宇宙微波背景（CMB）观测。我们描述了2005年南方冬季ACBAR的焦平面重建和性能。我们提出了一个新的CMB温度各向异性功率谱，用于完整的ACBAR数据集。2005年观测季节的数据增加了210%的数据集；天空覆盖率为490%；与以前的ACBAR版本相比。扩展的数据集使我们能够获得一组新的带功率测量值，具有更精细的[斜体1]分辨率和更小的不确定性。特别是，在包含第三和第四声学峰以及CMB功率谱的阻尼尾的角尺度上，波段功率不确定性降低了两倍以上。校准从6%显著提高；到2.2%;通过直接比较WMAP3和ACBAR测量的CMB各向异性图，将基于WMAP偶极子的校准转换为ACBAR。所得的功率谱与空间平坦、暗能量主导的Lambda CDM宇宙学的理论预测相一致。
The Arcminute Cosmology Bolometer Array Receiver (ACBAR) is a 16-element spiderweb bolometer array operating at 150 GHz. Mounted on the 2.1m Viper telescope, ACBAR has dedicated four years to cosmic microwave background (CMB) observations at the South Pole. We describe the focal plane reconstruction and performance of ACBAR for the 2005 austral winter. We present a new CMB temperature anisotropy power spectrum for the complete ACBAR data set. The addition of data from the 2005 observing season expands the data set by 210%; and the sky coverage by 490%; over the previous ACBAR releases. The expanded data set allows us to derive a new set of band-power measurements with finer [italic l]-resolution and dramatically smaller uncertainties. In particular, the band-power uncertainties have been reduced by more than a factor of two on angular scales encompassing the third and fourth acoustic peaks and the damping tail of the CMB power spectrum. The calibration has been significantly improved from 6%; to 2.2%; in temperature by using a direct comparison between CMB anisotropy maps measured by WMAP3 and ACBAR to transfer the WMAP dipole-based calibration to ACBAR. The resulting power spectrum is consistent with theoretical predications for a spatially flat, dark energy-dominated Lambda CDM cosmology.