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Abstract <p>This study is devoted to the cosmological ‘‘angular size–redshift’’ test. An analysis was performed of the angular and linear sizes of galaxies from the new ASTRODEEP-JWST catalog containing over 500 000 objects at high redshifts (up to <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(z\sim 20\)</EquationSource> <!--ASPBull2560038Raikov-m1--> </InlineEquation> photometrically determined and up to <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(z\sim 14\)</EquationSource> <!--ASPBull2560038Raikov-m2--> </InlineEquation> spectroscopically determined). For calculations, 6860 galaxies with reliably determined spectroscopic redshifts and 319 771 galaxies with known photometric redshifts were used. The linear sizes of galaxies were computed within the framework of two cosmological models—the standard (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\Lambda\)</EquationSource> <!--ASPBull2560038Raikov-m3--> </InlineEquation>CDM) model and one of the static models (the so-called ‘‘tired light’’ model). We have shown that within the framework of the <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\Lambda\)</EquationSource> <!--ASPBull2560038Raikov-m4--> </InlineEquation>CDM model, a significant evolution of the linear sizes of galaxies is observed, with the evolutionary rate closely matching the rate of the cosmic expansion. In contrast, in the static model, the characteristic linear sizes of galaxies exhibit almost no evolution with increasing <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(z\)</EquationSource> <!--ASPBull2560038Raikov-m5--> </InlineEquation>.</p>

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Cosmological Observational Tests in the JWST ERA. I: Angular Size–Redshift

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • A. A. Raikov,
  • V. V. Tsymbal,
  • N. Yu. Lovyagin

摘要

Abstract

This study is devoted to the cosmological ‘‘angular size–redshift’’ test. An analysis was performed of the angular and linear sizes of galaxies from the new ASTRODEEP-JWST catalog containing over 500 000 objects at high redshifts (up to \(z\sim 20\) photometrically determined and up to \(z\sim 14\) spectroscopically determined). For calculations, 6860 galaxies with reliably determined spectroscopic redshifts and 319 771 galaxies with known photometric redshifts were used. The linear sizes of galaxies were computed within the framework of two cosmological models—the standard ( \(\Lambda\) CDM) model and one of the static models (the so-called ‘‘tired light’’ model). We have shown that within the framework of the \(\Lambda\) CDM model, a significant evolution of the linear sizes of galaxies is observed, with the evolutionary rate closely matching the rate of the cosmic expansion. In contrast, in the static model, the characteristic linear sizes of galaxies exhibit almost no evolution with increasing \(z\) .