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

被引：3

作者：

Dhal, Somita ^{[1
]}

Singh, Sneha ^{[1
]}

Konar, Koustav ^{[2
]}

Paul, R. K. ^{[1
]}

机构：

[1] Birla Inst Technol, Dept Phys, Mesra Ranchi 835215, Jharkhand, India

[2] Ruhr Univ Bochum, D-44801 Bochum, Germany

来源：

EXPERIMENTAL ASTRONOMY | 2023年 / 56卷 / 2-3期

关键词：

Cosmic microwave background; Straight-line fit; Chemical potential; COBE; FIRAS; BLACKBODY RADIATION; TEMPERATURE; SPECTRUM; MONOPOLE;

D O I：

10.1007/s10686-023-09904-w

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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) x 10(-5) with an upper bound |mu| < 5.7 x 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 Delta mu < 1.2 x 10(-4) (95% confidence level). The upper limit of y- distortion is calculated as y < 1.0 x 10(-4) (95% confidence level).

引用

页码：715 / 726

页数：12

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