The Atacama Cosmology Telescope: measurement and analysis of 1D beams for DR4

The Atacama Cosmology Telescope: measurement and analysis of 1D beams for DR4
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阿塔卡马宇宙学望远镜:DR4 一维光束的测量和分析

DOI:
10.1088/1475-7516/2022/05/044
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发表时间:
2022
影响因子:
6.4
通讯作者:
Gallardo, Patricio A.
Gallardo, Patricio A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lungu, Marius;Storer, Emilie R.;Hasselfield, Matthew;Duivenvoorden, Adriaan J.;Calabrese, Erminia;Chesmore, Grace E.;Choi, Steve K.;Dunkley, Jo;Dünner, Rolando;Gallardo, Patricio A.

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我们描述的测量和治疗的望远镜光束的阿塔卡马宇宙望远镜的第四次数据发布,DR4。天王星的观测被用来测量光束的中心部分(<12 '),大约为峰值的-40 dB。这样的行星强度图用于构建方位角平均光束轮廓,其在被变换到傅立叶空间之前与物理激励模型拟合。我们调查和量化了一些的光束,所有这些都是很重要的精密宇宙学的100级的修正。利用天王星偏振图测量了光束主要部分的温度-偏振泄漏,在150 GHz(98 GHz)处的温度-偏振泄漏为2.5%(2.1%)。光束也有偏振旁瓣,这是测量与土星的观测和deprojected从ACT时间排序的数据。相对于过去的ACT光束分析的显着变化包括改进的减法天王星校准图的大气影响,在光束轮廓模型中的散射项的合并,和改进的光束模型的不确定性和ACT功率谱分析中的主要温度-偏振泄漏项。
We describe the measurement and treatment of the telescope beams for the Atacama Cosmology Telescope's fourth data release, DR4. Observations of Uranus are used to measure the central portion (< 12') of the beams to roughly-40 dB of the peak. Such planet maps in intensity are used to construct azimuthally averaged beam profiles, which are fit with a physically motivated model before being transformed into Fourier space. We investigate and quantify a number of percent-level corrections to the beams, all of which are important for precision cosmology. Uranus maps in polarization are used to measure the temperature-to-polarization leakage in the main part of the beams, which is≲ 1%(2.5%) at 150 GHz (98 GHz). The beams also have polarized sidelobes, which are measured with observations of Saturn and deprojected from the ACT time-ordered data. Notable changes relative to past ACT beam analyses include an improved subtraction of the atmospheric effects from Uranus calibration maps, incorporation of a scattering term in the beam profile model, and refinements to the beam model uncertainties and the main temperature-to-polarization leakage terms in the ACT power spectrum analysis.
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