Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Shi, Rui Appel, John W. Bennett, Charles L. Bustos, Ricardo Chuss, David T. Dahal, Sumit Couto, Jullianna Denes Eimer, Joseph R. Essinger-Hileman, Thomas Harrington, Kathleen Iuliano, Jeffrey Li, Yunyang Marriage, Tobias A. Petroff, Matthew A. Rostem, Karwan Song, Zeya Valle, Deniz A. N. Watts, Duncan J. Weiland, Janet L. Wollack, Edward J. Xu, Zhilei |
| author_facet | Shi, Rui Appel, John W. Bennett, Charles L. Bustos, Ricardo Chuss, David T. Dahal, Sumit Couto, Jullianna Denes Eimer, Joseph R. Essinger-Hileman, Thomas Harrington, Kathleen Iuliano, Jeffrey Li, Yunyang Marriage, Tobias A. Petroff, Matthew A. Rostem, Karwan Song, Zeya Valle, Deniz A. N. Watts, Duncan J. Weiland, Janet L. Wollack, Edward J. Xu, Zhilei |
| contents | Improved polarization measurements at frequencies below 70 GHz with degree-level angular resolution are crucial for advancing our understanding of the Galactic synchrotron radiation and the potential polarized anomalous microwave emission and ultimately benefiting the detection of primordial $B$ modes. In this study, we present sensitivity-improved 40 GHz polarization maps obtained by combining the CLASS 40 GHz and WMAP $Q$-band data through a weighted average in the harmonic domain. The decision to include WMAP $Q$-band data stems from similarities in the bandpasses. Leveraging the accurate large-scale measurements from WMAP $Q$ band and the high-sensitivity information from CLASS 40 GHz band at intermediate scales, the noise level at $\ell\in[30, 100]$ is reduced by a factor of $2-3$ in the map space. A pixel domain analysis of the polarized synchrotron spectral index ($β_s$) using WMAP $K$ band and the combined maps (mean and 16/84th percentile across the $β_s$ map: $-3.08_{-0.20}^{+0.20}$) reveals a stronger preference for spatial variation (PTE for a uniform $β_s$ hypothesis smaller than 0.001) than the results obtained using WMAP $K$ and $Ka$ bands ($-3.08_{-0.14}^{+0.14}$). The cross-power spectra of the combined maps follow the same trend as other low-frequency data, and validation through simulations indicates negligible bias introduced by the combination method (sub-percent level in the power spectra). The products of this work are publicly available on $\mathtt{LAMBDA}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_17567 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data Shi, Rui Appel, John W. Bennett, Charles L. Bustos, Ricardo Chuss, David T. Dahal, Sumit Couto, Jullianna Denes Eimer, Joseph R. Essinger-Hileman, Thomas Harrington, Kathleen Iuliano, Jeffrey Li, Yunyang Marriage, Tobias A. Petroff, Matthew A. Rostem, Karwan Song, Zeya Valle, Deniz A. N. Watts, Duncan J. Weiland, Janet L. Wollack, Edward J. Xu, Zhilei Cosmology and Nongalactic Astrophysics Improved polarization measurements at frequencies below 70 GHz with degree-level angular resolution are crucial for advancing our understanding of the Galactic synchrotron radiation and the potential polarized anomalous microwave emission and ultimately benefiting the detection of primordial $B$ modes. In this study, we present sensitivity-improved 40 GHz polarization maps obtained by combining the CLASS 40 GHz and WMAP $Q$-band data through a weighted average in the harmonic domain. The decision to include WMAP $Q$-band data stems from similarities in the bandpasses. Leveraging the accurate large-scale measurements from WMAP $Q$ band and the high-sensitivity information from CLASS 40 GHz band at intermediate scales, the noise level at $\ell\in[30, 100]$ is reduced by a factor of $2-3$ in the map space. A pixel domain analysis of the polarized synchrotron spectral index ($β_s$) using WMAP $K$ band and the combined maps (mean and 16/84th percentile across the $β_s$ map: $-3.08_{-0.20}^{+0.20}$) reveals a stronger preference for spatial variation (PTE for a uniform $β_s$ hypothesis smaller than 0.001) than the results obtained using WMAP $K$ and $Ka$ bands ($-3.08_{-0.14}^{+0.14}$). The cross-power spectra of the combined maps follow the same trend as other low-frequency data, and validation through simulations indicates negligible bias introduced by the combination method (sub-percent level in the power spectra). The products of this work are publicly available on $\mathtt{LAMBDA}$. |
| title | Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.17567 |