南極望遠鏡の新カメラの結果が明らかに(Results from South Pole Telescope’s new camera emerge)

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2024-02-08 アルゴンヌ国立研究所(ANL)

South pole telescope

南極の望遠鏡で行われた5年以上にわたる観測は、宇宙の初期形成からの残光を捉えています。最新のデータ分析では、初めてのCMB重力レンズ測定が行われ、既存の重力理論の検証や暗黒物質の理解に貢献しています。この成果は、宇宙の成り立ちや暗黒物質の役割など、我々の宇宙の性質についての新たな洞察をもたらす可能性があります。

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天体物理的前景が存在する場合のCMBのレイリー散乱に対する地上感度の予測 Forecasting ground-based sensitivity to the Rayleigh scattering of the CMB in the presence of astrophysical foregrounds

Karia R. Dibert, Adam J. Anderson, Amy N. Bender, Bradford A. Benson, Federico Bianchini, John E. Carlstrom, Thomas M. Crawford, Riccardo Gualtieri, Yuuki Omori, Zhaodi Pan, Srinivasan Raghunathan, Christian L. Reichardt, and W. L. Kimmy Wu
Physical Review D  Published 6 September 2022

Figure 1

ABSTRACT

The Rayleigh scattering of cosmic microwave background (CMB) photons off the neutral hydrogen produced during recombination effectively creates an additional scattering surface after recombination that encodes new cosmological information, including the expansion and ionization history of the universe. A first detection of Rayleigh scattering is a tantalizing target for next-generation CMB experiments. We have developed a Rayleigh scattering forecasting pipeline that includes instrumental effects, atmospheric noise, and astrophysical foregrounds (e.g., Galactic dust, cosmic infrared background, or CIB, and the thermal Sunyaev-Zel’dovich effect). We forecast the Rayleigh scattering detection significance for several upcoming ground-based experiments, including SPT−3G+, Simons Observatory, CCAT-prime, and CMB-S4, and examine the limitations from atmospheric and astrophysical foregrounds as well as potential mitigation strategies. When combined with Planck data, we estimate that the ground-based experiments will detect Rayleigh scattering with a significance between 1.6 and 3.7, primarily limited by atmospheric noise and the CIB.

1701物理及び化学
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