Calculation of Cosmic microwave background radiation parameters using COBE/FIRAS dataset

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Experimental Astronomy Pub Date : 2023-06-08 DOI:10.1007/s10686-023-09904-w

Somita Dhal, Sneha Singh, Koustav Konar, R. K. Paul

引用次数: 0

Abstract

In this paper, we estimate the Cosmic Microwave Background (CMB) temperature using the data of the monopole spectrum from the Cosmic Background Explorer/ Far-Infrared Absolute Spectrophotometer (COBE/FIRAS). Utilising the idea of straight-line fitting, we obtain the temperature and chemical potential. The temperature of the CMB is found to be (2.725007 ± 0.000024) K (only statistical error) by using the monopole spectrum. Handling the data of the monopole spectrum the chemical potential is obtained as (-1.1 ± 3.4) × 10^–5 with an upper bound |µ| < 5.7 × 10^–5(95% confidence level). The amplitude of the CMB dipole is found to be, T_amp = (3.47 ± 0.11) mK. We estimate an upper limit for the rms value of the fluctuation in chemical potential as Δµ < 1.2 × 10^–4 (95% confidence level). The upper limit of y- distortion is calculated as y < 1.0 × 10^–4 (95% confidence level).

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利用 COBE/FIRAS 数据集计算宇宙微波背景辐射参数

在本文中，我们利用宇宙背景探测器/远红外绝对分光光度计（COBE/FIRAS）的单极光谱数据估算了宇宙微波背景（CMB）的温度。利用直线拟合的思想，我们得到了温度和化学势。通过使用单极子光谱，我们发现 CMB 的温度为 (2.725007 ± 0.000024) K（仅有统计误差）。通过处理单极谱数据，得到化学势为 (-1.1 ± 3.4) × 10-5，上限为 |µ| < 5.7 × 10-5（95% 置信度）。CMB 偶极子的振幅为 Tamp = (3.47 ± 0.11) mK。我们估计化学势波动的均方根值上限为 Δµ < 1.2 × 10-4 （95% 置信度）。y- 扭曲的上限计算为 y < 1.0 × 10-4（95% 置信度）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.