A Measurement of the Largest-Scale CMB E-mode Polarization with CLASS
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Li, Yunyang Eimer, Joseph Appel, John Bennett, Charles Brewer, Michael Bruno, Sarah Marie Bustos, Ricardo Chan, Carol Chuss, David Cleary, Joseph Dahal, Sumit Datta, Rahul Couto, Jullianna Denes Denis, Kevin Dunner, Rolando Essinger-Hileman, Thomas Harrington, Kathleen Helson, Kyle Hubmayr, Johannes Iuliano, Jeffrey Karakla, John Marriage, Tobias Miller, Nathan Perez, Carolina Morales Parker, Lucas Petroff, Matthew Reeves, Rodrigo Rostem, Karwan Ryan, Caleigh Shi, Rui Shukawa, Koji Valle, Deniz Watts, Duncan Weiland, J. Wollack, Edward Xu, Zhilei Zeng, Lingzhen |
| author_facet | Li, Yunyang Eimer, Joseph Appel, John Bennett, Charles Brewer, Michael Bruno, Sarah Marie Bustos, Ricardo Chan, Carol Chuss, David Cleary, Joseph Dahal, Sumit Datta, Rahul Couto, Jullianna Denes Denis, Kevin Dunner, Rolando Essinger-Hileman, Thomas Harrington, Kathleen Helson, Kyle Hubmayr, Johannes Iuliano, Jeffrey Karakla, John Marriage, Tobias Miller, Nathan Perez, Carolina Morales Parker, Lucas Petroff, Matthew Reeves, Rodrigo Rostem, Karwan Ryan, Caleigh Shi, Rui Shukawa, Koji Valle, Deniz Watts, Duncan Weiland, J. Wollack, Edward Xu, Zhilei Zeng, Lingzhen |
| contents | We present measurements of large-scale cosmic microwave background (CMB) E-mode polarization from the Cosmology Large Angular Scale Surveyor (CLASS) 90 GHz data. Using 115 det-yr of observations collected through 2024 with a variable-delay polarization modulator, we achieved a polarization sensitivity of $78\,\mathrm{μK\,arcmin}$, comparable to Planck at similar frequencies (100 and 143 GHz). The analysis demonstrates effective mitigation of systematic errors and addresses challenges to large-angular-scale power recovery posed by time-domain filtering in maximum-likelihood map-making. A novel implementation of the pixel-space transfer matrix is introduced, which enables efficient filtering simulations and bias correction in the power spectrum using the quadratic cross-spectrum estimator. Overall, we achieved an unbiased time-domain filtering correction to recover the largest angular scale polarization, with the only power deficit, arising from map-making non-linearity, being characterized as less than $3\%$. Through cross-correlation with Planck, we detected the cosmic reionization at $99.4\%$ significance and measured the reionization optical depth $τ=0.053^{+0.018}_{-0.019}$, marking the first ground-based attempt at such a measurement. At intermediate angular scales ($\ell>30$), our results, both independently and in cross-correlation with Planck, remain fully consistent with Planck's measurements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_11904 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Measurement of the Largest-Scale CMB E-mode Polarization with CLASS Li, Yunyang Eimer, Joseph Appel, John Bennett, Charles Brewer, Michael Bruno, Sarah Marie Bustos, Ricardo Chan, Carol Chuss, David Cleary, Joseph Dahal, Sumit Datta, Rahul Couto, Jullianna Denes Denis, Kevin Dunner, Rolando Essinger-Hileman, Thomas Harrington, Kathleen Helson, Kyle Hubmayr, Johannes Iuliano, Jeffrey Karakla, John Marriage, Tobias Miller, Nathan Perez, Carolina Morales Parker, Lucas Petroff, Matthew Reeves, Rodrigo Rostem, Karwan Ryan, Caleigh Shi, Rui Shukawa, Koji Valle, Deniz Watts, Duncan Weiland, J. Wollack, Edward Xu, Zhilei Zeng, Lingzhen Cosmology and Nongalactic Astrophysics We present measurements of large-scale cosmic microwave background (CMB) E-mode polarization from the Cosmology Large Angular Scale Surveyor (CLASS) 90 GHz data. Using 115 det-yr of observations collected through 2024 with a variable-delay polarization modulator, we achieved a polarization sensitivity of $78\,\mathrm{μK\,arcmin}$, comparable to Planck at similar frequencies (100 and 143 GHz). The analysis demonstrates effective mitigation of systematic errors and addresses challenges to large-angular-scale power recovery posed by time-domain filtering in maximum-likelihood map-making. A novel implementation of the pixel-space transfer matrix is introduced, which enables efficient filtering simulations and bias correction in the power spectrum using the quadratic cross-spectrum estimator. Overall, we achieved an unbiased time-domain filtering correction to recover the largest angular scale polarization, with the only power deficit, arising from map-making non-linearity, being characterized as less than $3\%$. Through cross-correlation with Planck, we detected the cosmic reionization at $99.4\%$ significance and measured the reionization optical depth $τ=0.053^{+0.018}_{-0.019}$, marking the first ground-based attempt at such a measurement. At intermediate angular scales ($\ell>30$), our results, both independently and in cross-correlation with Planck, remain fully consistent with Planck's measurements. |
| title | A Measurement of the Largest-Scale CMB E-mode Polarization with CLASS |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2501.11904 |