تقرير
Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data
| العنوان: | Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data |
|---|---|
| المؤلفون: | 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 |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | 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 ($\beta_s$) using WMAP $K$ band and the combined maps (mean and 16/84th percentile across the $\beta_s$ map: $-3.08_{-0.20}^{+0.20}$) reveals a stronger preference for spatial variation (PTE for a uniform $\beta_s$ 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 $\mathtt{LAMBDA}$. Comment: 19 pages, 16 figures, 1 table, accepted for publication in ApJ |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2404.17567 |
| رقم الأكسشن: | edsarx.2404.17567 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |