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The effects of the mechanical performance and alignment of the Atacama Cosmology Telescope on the sensitivity of microwave observations

机译:阿塔卡马宇宙望远镜的机械性能和对准对微波观测灵敏度的影响

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The Atacama Cosmology Telescope is a six meter, off-axis Gregorian telescope for measuring the cosmic microwave background at arcminute resolutions. The Millimeter Bolometer Array Camera (MBAC) is its current science instrument. Erected in the Atacama Desert of Chile in early 2007, it saw first light with the MBAC on 22 October 2007. In this paper we review its performance after one month of observing, focusing in particular on issues surrounding the alignment of the optical system that impact the sensitivity of the experiment. We discuss the telescope motion, pointing, and susceptibility to thermal distortions. We describe the mirror alignment procedure, which has yielded surface deviations of 31 μm rms on the primary and 10 μm rms on the secondary. Observations of planets show that the optical performance is consistent with the telescope design parameters. Preliminary analysis measures a solid angle of about 215 nanosteradians with a full width at half maximum of 1.44 arcminutes at 145 GHz.
机译:阿塔卡马宇宙望远镜是六米偏轴格里高里望远镜,用于以弧分分辨率测量宇宙微波背景。毫米波阵列相机(MBAC)是其当前的科学仪器。它于2007年初架设在智利的阿塔卡马沙漠,于2007年10月22日在MBAC上首次亮相。在本文中,我们经过一个月的观察后回顾了它的性能,尤其着重于影响光学系统对准的问题实验的敏感性。我们讨论了望远镜的运动,指向和热变形的敏感性。我们描述了镜面对准过程,该过程在主表面上产生了31μmrms的表面偏差,在次生表面上产生了10μmrms的表面偏差。对行星的观察表明,光学性能与望远镜的设计参数一致。初步分析测得约215个纳米立体角的立体角在145 GHz处的半峰全宽为1.44弧分。

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