Estimates of Extragalactic Background and Confusion Noise Parameters for the Millimetron Telescope

Ermash, A. A.; Пилипенко, С. В.; Lukash, V. N.

doi:10.1134/s1063773720050023

Cited by 4 publications

(10 citation statements)

References 101 publications

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“…However, the same cannot be said about AGN. In this case, as was shown, for example, in [6], AGNs make a noticeable contribution to the extragalactic background spectrum in the 70 and 110 μm bands. To estimate the effect of variability, we created a series of model maps for observations over one year with a step of 1 day.…”

Section: Estimating the Variability Of The Extragalactic Backgroundsupporting

confidence: 67%

“…As shown in [6], for a with a main mirror diameter m, the confusion noise has a peak at a wavelength μm. However, when moving to large diameters of the main mirror, the situation changes, and the confusion noise continues to increase with increasing wavelength.…”

Section: Dependence Of the Confusion Noise On The Telescope Diameter For Different Wavelengthsmentioning

confidence: 99%

“…To simulate the variability curve with N points, a signal covariance matrix is created in the form: (5) This matrix should be subjected to the Cholesky decomposition in the form , where is the upper triangular matrix. According to well-known formulas, the Cholesky expansion is calculated as follows (6) where is an element of the Cholesky matrix, is an element of the covariance matrix. Calculations are performed from top to bottom from left to right.…”

Section: Estimating the Variability Of The Extragalactic Backgroundmentioning

confidence: 99%

“…Earlier, we created a model of the extragalactic background (see [6]), gave a detailed description of the model and compared its results with the predictions of other models and observational data on the following parameters: 1) differential number counts of sources; 2) changing the counts of redshift sources; 3) the full frequency spectrum of the background; and 4) predictions of noise confusion for the Millimetron space observatory and the Herschel telescope.…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that such a binary classification is simplified, and there are a number of models that combine both approaches. Our model, presented in [6], belongs to the class of semi-analytical models based on the numerical calculation for the large-scale structure of the Universe.…”

Section: Introductionmentioning

confidence: 99%

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Confusion Noise Sources in the Infrared Wavelength Range

et al. 2021

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Within the framework of the model of the extragalactic background created earlier by the authors, the factors influencing the statistical properties of the confusion noise have been investigated. We showed the following aspects: (1) considering the large-scale structure of the Universe is an important factor; (2) gravitational lensing has no significant effect on the value of confusion noise; (3) the minimum redshift of objects that create confusion noise does not depend on the wavelength and is , the maximum redshift in the transition from 70 to 2000 μm smoothly changes from to ; (4) at short wavelengths ( μm), the main contribution to the confusion noise is made by galaxies with luminosities in the range and at long wavelengths (650-2000 μm)-with ;(5) the contribution to the confusion noise of objects with different color indices is considered; and (6) the variability of the extragalactic background created by active galactic nuclei on a time scale from 1 day to a year is noticeable at short wavelengths (70-350 μm) and manifests itself for flux densities μJy.

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Section: Estimating the Variability Of The Extragalactic Backgroundsupporting

confidence: 67%

Section: Dependence Of the Confusion Noise On The Telescope Diameter For Different Wavelengthsmentioning

confidence: 99%

Section: Estimating the Variability Of The Extragalactic Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Confusion Noise Sources in the Infrared Wavelength Range

et al. 2021

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Observational Manifestations of First Galaxies in the Far Infrared Range

et al. 2022

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Sources of confusion noise in the infrared wavelength range

Ermash

Пилипенко

Miheeva

et al. 2021

Preprint

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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 ∼ 0.5 − 0.6, while upper redshift limit gradually changes from ∼ 4 to ∼ 3 with the increase of wavelength from 70µm up to 2000µm; (4) at rather short wavelengths ( 70µm) galaxies with luminosities in the range 10 7 L -10 9 L give the most contribution to the confusion noise, while at larger wavelengths (650-2000µm) their luminosities are greater than L ≥ 10 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 (70-350µm) and manifests at fluxes < ∼ 1 mJy.

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Estimates of Extragalactic Background and Confusion Noise Parameters for the Millimetron Telescope

Cited by 4 publications

References 101 publications

Confusion Noise Sources in the Infrared Wavelength Range

Confusion Noise Sources in the Infrared Wavelength Range

Observational Manifestations of First Galaxies in the Far Infrared Range

Sources of confusion noise in the infrared wavelength range

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