中文

BeyondPlanck XVI. 基于 Planck LFI 与 WMAP 的大尺度偏振反常微波辐射限制

宇宙学与河外天体物理 2023-06-28 v2

摘要

我们在贝叶斯 CMB 分析框架内,利用 Planck\textit{Planck} LFI 与 WMAP\textit{WMAP} 偏振数据约束大角尺度上偏振反常微波辐射(AME)的水平。我们以幂律谱能量分布为同步辐射建模,并以 Planck\textit{Planck} HFI 353 GHz 数据通过线性回归为 AME 与热尘埃辐射之和建模。这种基于模板的尘埃辐射模型使我们能在对频率依赖性作最小假设的同时约束偏振 AME 的水平。我们忽略宇宙微波背景涨落,但通过模拟表明其对结果影响甚微。我们发现所得 AME 偏振度置信限对偏振同步辐射谱指数先验敏感;对于陡于 βs=3.1±0.1\beta_{\mathrm{s}} = -3.1\pm0.1 的先验,我们得到上限 pAMEmax0.6%p_{\mathrm{AME}}^{\rm max}\lesssim 0.6\,\%95%95\,\% 置信度)。相反,对于 βs=3.0±0.1\beta_{\mathrm{s}}=-3.0\pm0.1,我们得到标称探测值 pAME=2.5±1.0%p_{\mathrm{AME}}=2.5\pm1.0\,\%95%95\,\% 置信度)。因此,这些数据尚不足以同时稳健地约束偏振同步辐射与 AME,故我们的主要结果是将 AME 偏振度显式地作为 βs\beta_\mathrm{s} 的函数给出约束。将当前 Planck\textit{Planck}WMAP\textit{WMAP} 观测与 C-BASS 和 QUIJOTE 等高灵敏度低频实验的测量结合,对于进一步改善这些限制至关重要。

关键词

引用

@article{arxiv.2201.03530,
  title  = {BeyondPlanck XVI. Limits on Large-Scale Polarized Anomalous Microwave Emission from Planck LFI and WMAP},
  author = {D. Herman and B. Hensley and K. J. Andersen and R. Aurlien and R. Banerji and M. Bersanelli and S. Bertocco and M. Brilenkov and M. Carbone and L. P. L. Colombo and H. K. Eriksen and M. K. Foss and C. Franceschet and U. Fuskeland and S. Galeotta and M. Galloway and S. Gerakakis and E. Gjerløw and M. Iacobellis and M. Ieronymaki and H. T. Ihle and J. B. Jewell and A. Karakci and E. Keihänen and R. Keskitalo and G. Maggio and D. Maino and M. Maris and S. Paradiso and B. Partridge and M. Reinecke and A. -S. Suur-Uski and T. L. Svalheim and D. Tavagnacco and H. Thommesen and D. J. Watts and I. K. Wehus and A. Zacchei},
  journal= {arXiv preprint arXiv:2201.03530},
  year   = {2023}
}

备注

10 pages, 9 figures, part 15 of the BeyondPlanck release. All BeyondPlanck products and software will be released publicly at http://beyondplanck.science. Refereed, edited, and accepted by A&A. Added references, added arxiv IDs to BeyondPlanck papers. Figure update. Expanded discussion on AME models. Moved title from BeyondPlanck XV to BeyondPlanck XVI due to internal reordering