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Abstract <p>The paper presents the results of measurements of the background brightness of the sky in the IR range at the Caucasian Mountain Observatory (CMO) and the Crimean Astronomical Station (CAS) of the Sternberg Astronomical Institute of the Moscow State University (SAI MSU) carried out in 2024–2025. We propose and test a method for taking into account the instrumental background, the contribution of which may exceed the measured signal by factors of tens. The average brightness of the 1-arcsec<sup>2</sup> area of the sky at the zenith in the <i>L</i> band is 10<sup>4</sup> photon/(s m<sup>2</sup> nm) (~5<sup><i>m</i></sup>/arcsec<sup>2</sup>) for the CMO and 5 × 10<sup>4</sup> photon/(s m<sup>2</sup> nm) (~3.5<sup><i>m</i></sup>/arcsec<sup>2</sup>) for the CAS, while in the <i>M</i> band it is 1.7 × 10<sup>5</sup> photon/(s m<sup>2</sup> nm) (~1.2<sup><i>m</i></sup>/arcsec<sup>2</sup>) for the CMO and 4 × 10<sup>5</sup> photon/(s m<sup>2</sup> nm) (~0.2<sup><i>m</i></sup>/arcsec<sup>2</sup>) for the CAS. It has been shown that the background brightness changes after sunrise by no more than 20%. The average optical thickness over the entire period of our measurements was <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({{\tau }_{L}} = 0.09 \pm 0.02\)</EquationSource> <!--AstEng2670041Tatarnikov-m1--> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({{\tau }_{M}} = 0.33 \pm 0.05\)</EquationSource> <!--AstEng2670041Tatarnikov-m2--> </InlineEquation> at the CMO, and it was <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({{\tau }_{L}} = 0.14 \pm 0.05\)</EquationSource> <!--AstEng2670041Tatarnikov-m3--> </InlineEquation> and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({{\tau }_{M}} = 0.5 \pm 0.1\)</EquationSource> <!--AstEng2670041Tatarnikov-m4--> </InlineEquation> at the CAS.</p>

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Measurements of the IR Background at Wavelengths of 3–5 μm

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • A. M. Tatarnikov,
  • S. G. Zheltoukhov,
  • V. I. Shenavrin,
  • I. A. Komarova

摘要

Abstract

The paper presents the results of measurements of the background brightness of the sky in the IR range at the Caucasian Mountain Observatory (CMO) and the Crimean Astronomical Station (CAS) of the Sternberg Astronomical Institute of the Moscow State University (SAI MSU) carried out in 2024–2025. We propose and test a method for taking into account the instrumental background, the contribution of which may exceed the measured signal by factors of tens. The average brightness of the 1-arcsec2 area of the sky at the zenith in the L band is 104 photon/(s m2 nm) (~5m/arcsec2) for the CMO and 5 × 104 photon/(s m2 nm) (~3.5m/arcsec2) for the CAS, while in the M band it is 1.7 × 105 photon/(s m2 nm) (~1.2m/arcsec2) for the CMO and 4 × 105 photon/(s m2 nm) (~0.2m/arcsec2) for the CAS. It has been shown that the background brightness changes after sunrise by no more than 20%. The average optical thickness over the entire period of our measurements was \({{\tau }_{L}} = 0.09 \pm 0.02\) and \({{\tau }_{M}} = 0.33 \pm 0.05\) at the CMO, and it was \({{\tau }_{L}} = 0.14 \pm 0.05\) and \({{\tau }_{M}} = 0.5 \pm 0.1\) at the CAS.