CLASS Angular Power Spectra and Map-component Analysis for 40 GHz Observations through 2022

• DOI: 10.3847/1538-4357/ad1abf
• Publication Date: 2024-03-04T08:01:25Z
• Authors: Joseph R. Eimer; Yunyang 云炀 Li 李; Michael K. Brewer; Rui 瑞 Shi 时; Aamir Ali; John W. Appel; Charles L. Bennett; Sarah Marie Bruno; Ricardo Bustos; David T. Chuss; Joseph Cleary; Sumit Dahal; Rahul Datta; Jullianna Denes C...; Kevin L. Denis; Rolando Dünner; Thomas Essinger-H...; Pedro Fluxá; Johannes Hubmayer; Kathleen Harrington; Jeffrey Iuliano; John Karakla; Tobias A. Marriage; Carolina Núñez; Lucas Parker; Matthew A. Petroff; Rodrigo A. Reeves; Karwan Rostem; Deniz A. N. Valle; Duncan J. Watts; Janet L. Weiland; Edward J. Wollack; Zhilei 智磊 Xu 徐; Lingzhen Zeng
• Keywords: Component (thermodynamics)

Abstract Measurement of the largest angular scale ( ℓ &lt; 30) features cosmic microwave background (CMB) polarization is a powerful way to constrain optical depth reionization and search for signature inflation through detection primordial B -modes. We present an analysis maps covering 73.6% sky made from 40 GHz channel Cosmology Large Angular Scale Surveyor (CLASS) 2016 August 2022 May. Taking advantage measurement stability enabled by front-end modulation excellent conditions Atacama Desert, we show this achieves higher sensitivity than analogous frequencies satellite measurements in range 10 100. Simulations CLASS linear (circular) have white noise level <?CDATA $125(130)\,\mu {\rm{K}}\,\mathrm{arcmin}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>125</mml:mn> <mml:mo stretchy="false">(</mml:mo> <mml:mn>130</mml:mn> stretchy="false">)</mml:mo> <mml:mspace width="0.25em" /> <mml:mi>μ</mml:mi> <mml:mi mathvariant="normal">K</mml:mi> <mml:mi>arcmin</mml:mi> </mml:math> . measure Galaxy-masked EE BB spectra diffuse synchrotron radiation compare space-based at similar frequencies. In combination with external data, expand spatial variations spectral energy density (SED) include new regions SED harmonic domain. place upper limit on circular 5 125 first bin showing D 0.023 $\mu {{\rm{K}}}_{\mathrm{CMB}}^{2}$?> <mml:msubsup> <mml:mrow> </mml:mrow> <mml:mi>CMB</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> 95% confidence. These results establish standard recovery largest-scale CMB ground signal exciting possibilities when higher-frequency channels are included analysis.