تقرير
The Simons Observatory: component separation pipelines for B-modes
| العنوان: | The Simons Observatory: component separation pipelines for B-modes |
|---|---|
| المؤلفون: | Wolz, Kevin, Azzoni, Susanna, Hervías-Caimapo, Carlos, Errard, Josquin, Krachmalnicoff, Nicoletta, Alonso, David, Beringue, Benjamin, Hertig, Emilie |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | The upcoming Simons Observatory (SO) Small Aperture Telescopes aim at observing the degree-scale anisotropies of the polarized CMB to constrain the primordial tensor-to-scalar ratio $r$ at the level of $\sigma(r=0)\lesssim0.003$ to probe models of the very early Universe. We present three complementary $r$ inference pipelines and compare their results on a set of sky simulations that allow us to explore a number of Galactic foreground and instrumental noise models, relevant for SO. In most scenarios, the pipelines retrieve consistent and unbiased results. However, several complex foreground scenarios lead to a $>2\sigma$ bias on $r$ if analyzed with the default versions of these pipelines, highlighting the need for more sophisticated pipeline components that marginalize over foreground residuals. We present two such extensions, using power-spectrum-based and map-based methods, and show that they fully reduce the bias on $r$ to sub-sigma level in all scenarios, and at a moderate cost in terms of $\sigma(r)$. Comment: 4 pages, 1 figure. Contribution to the 2024 Cosmology session of the 58th Rencontres de Moriond |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.06891 |
| رقم الأكسشن: | edsarx.2407.06891 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |