Sources of confusion noise in the infrared wavelength range

A. A. Ermash; S. V. Pilipenko; E. V. Miheeva; V. N. Lukash

doi:10.1134/S1063772922010048

paper

Sources of confusion noise in the infrared wavelength range

arXiv:2111.14679 · doi:10.1134/S1063772922010048

Abstract

In this paper we use the model of extragalactic background light to investigate the factors that have influence on the confusion noise. It was shown that (1) Large-Scale Structure of the Universe is an important factor; (2) gravitational lensing does not have a significant effect on the confusion noise; (3) lower redshift limit of objects that contribute to the confusion noise does not depend on the wavelength and is about $z_{min} \sim 0.5 - 0.6$ , while upper redshift limit gradually changes from $\sim 4$ to $\sim 3$ with the increase of wavelength from 70 $μ m$ up to 2000 $μ m$ ; (4) at rather short wavelengths ( $≃ 70 μ m$ ) galaxies with luminosities in the range $1 0^{7} L_{⊙}$ -- $1 0^{9} L_{⊙}$ give the most contribution to the confusion noise, while at larger wavelengths (650-2000 $μ m$ ) their luminosities are greater than $L \geq 1 0^{10} L_{⊙}$ ; (5) contribution from objects with different color characteristics is considered; (6) the variability of the extragalactic background on the timescale from 1 day to 1 year is noticeable at short wavelengths (70--350 $μ m$ ) and manifests at fluxes $_{\sim}^{<}$ 1~mJy.

Sources of confusion noise in the infrared wavelength range

Abstract

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