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

• Published in: Astronomy letters Vol. 46; no. 5; pp. 298 - 311
• Main Authors: Ermash, A. A., Pilipenko, S. V., Lukash, V. N.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-05-2020; Springer Nature B.V
• Subjects: Angular resolution; Astronomy; Astrophysics and Astroparticles; Background noise; Confusion; Criteria; Estimates; Galaxies; Infrared telescopes; Mathematical models; Noise; Observations and Techniques; Parameter sensitivity; Physics; Physics and Astronomy; Red shift; Telescopes; far infrared; evolution of galaxies
• ISSN: 1063-7737; 1562-6873
• DOI: 10.1134/S1063773720050023

The sensitivity of future far-infrared telescopes, such as Millimetron, will be limited by the confusion noise produced by distant galaxies. We have constructed a model of the cosmic infrared background whose main goal is to investigate the confusion noise parameters. The model is based on the publicly accessible eGALICS simulation. For each galaxy from the simulation we construct a model spectrum using the GRASIL and CHE_EVO codes, which allows the source counts, the background spectrum, and various parameters to be obtained. Our results are compared with the observational data and the predictions of other models. We conclude that our model reproduces the observational data with sufficient confidence. However, it is worth noting that the models predict various distributions of sources on the flux–redshift plane, especially at high
. We have made confusion noise estimates based on the source counts (the source density criterion, the probability of deflection criterion, etc.) and model maps. A limited angular resolution of observations is shown to affect the source count curves and the confusion noise estimates. In contrast to other works in this field, we have obtained infrared background intensity maps and catalogs of model galaxies with realistic spectra suitable for studying the methods of struggling with the confusion effect.