Journal Article

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

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

2023

Overview

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).

• Publisher: Springer Netherlands,Springer Nature B.V
• Subject: Astronomy / Background radiation / Chemical potential / Chemistry and Earth Sciences / Computer Science / Confidence intervals / Cosmic Background Explorer satellite / Cosmic microwave background / Dipoles / Far infrared radiation / Infrared spectrophotometers / Investigations / Linear equations / Observations and Techniques / Physics / Physics and Astronomy / Radiation / Statistical analysis / Statistics for Engineering / Straight line fitting / Upper bounds