Spectral Imaging with QUBIC: building frequency maps from Time-Ordered-Data using Bolometric Interferometry
Université Paris Cité（巴黎西岱大学）；CNRS（法国国家科学研究中心）；University of Richmond（里士满大学）；Ecole polytechnique（巴黎综合理工学院）；Institut Polytechnique de Paris（巴黎理工学院）；Facultad de Ciencias Astronómicas y Geofísicas (Universidad Nacional de La Plata)（拉普拉塔国立大学天文与地球物理学院）；Universidad de Chile（智利大学）
M. Regnier, T. Laclavère, J-Ch. Hamilton, E. Bunn, V. Chabirand, P. Chanial, L. Goetz, L. Kardum, A. Huchet, P. Masson, N. Miron Granese, C. G. Scóccola, S. A. … 展开作者
M. Regnier, T. Laclavère, J-Ch. Hamilton, E. Bunn, V. Chabirand, P. Chanial, L. Goetz, L. Kardum, A. Huchet, P. Masson, N. Miron Granese, C. G. Scóccola, S. A. Torchinsky, E. Battistelli, M. Bersanelli, F. Columbro, A. Coppolecchia, B. Costanza, P. De Bernardis, G. De Gasperis, S. Ferazzoli, A. Flood, K. Ganga, M. Gervasi, L. Grandsire, E . Manzan, S. Masi, A. Mennella, L. Mousset, C. O'Sullivan, A. Paiella, F. Piacentini, M. Piat, L. Piccirillo, E. Rasztocky, M. Stolpovskiy, M. Zannoni
The search for relics from the inflation era in the form of B-mode polarization of the CMB is a major challenge in cosmology. The main obstacle appears to come from the complexity of Galactic foregrounds that need to be removed. Multi-frequency observations are key to mitigating their contamination and mapping primordial fluctuations. We present spectral-imaging, a method to reconstruct sub-frequency maps of the CMB polarization within the instrument's physical bandwidth, a unique feature of Bolometric Interferometry that could be crucial for foreground mitigation as it provides an increased spectral resolution. Our technique uses the frequency evolution of the shape of the Bolometric Interferometer's synthesized beam to reconstruct frequency information from the time domain data. We reconstruct sub-frequency maps using an inverse problem approach based on detailed modeling of the instrument acquisition. We use external data to regularize the convergence of the estimator and account for bandpass mismatch and varying angular resolution. The reconstructed maps are unbiased and allow exploiting the spectral-imaging capacity of QUBIC. Using end-to-end simulations of the QUBIC instrument, we perform a cross-spectra analysis to extract a forecast on the tensor-to-scalar ratio constraint of $σ(r)= 0.0225$ after component separation.
Spectral Imaging with QUBIC: building astrophysical components from Time-Ordered-Data using Bolometric Interferometry
Université de Paris（巴黎大学）；University of Richmond（里士满大学）；Universidad de Chile（智利大学）；National University of Ireland, Maynooth（爱尔兰国立大学梅努斯分校）；Laboratoire de Physique de l’École Normale Supérieure（巴黎高等师范学院物理实验室）；University of Manchester（曼彻斯特大学）；International Space Science Institute (ISSI)（国际空间科学研究所）；University of Bern（伯尔尼大学）
QUBIC: using NbSi TESs with a bolometric interferometer to characterize the polarisation of the CMB
QUBIC（Q \& U Bolometric Interferometer for Cosmology）是一个国际地面实验，专门用于测量宇宙微波背景（CMB）的偏振起伏。它是基于测热干涉测量，一个原始的检测技术相结合的免疫系统的影响与低温非相干探测器的灵敏度的干涉仪。QUBIC将部署在阿根廷萨尔塔省San Antonio de los Cobres附近的Alto Chorrillos山区。QUBIC检测链由2048个冷却至350 mK的NbSi跃迁边缘传感器（TES）组成。电压偏置的TES通过基于1 K超导量子干涉器件（SQUID）和60 K新型SiGe专用集成电路（ASIC）的时域多路复用读取，从而实现前所未有的复用（MUX）因子128。QUBIC实验目前正在实验室中进行表征，在升级到完整仪器之前，减少了探测器的数量。我将介绍这个表征阶段的最后结果，重点是探测器和读出系统。
Implementation of frequency-correlated noise in CMB component separation: Method, Validation, and Early Applications
Università di Trento（特伦托大学）；Dipartimento di Fisica, Università degli Studi di Milano（米兰大学物理系）；INFN sezione di Milano（意大利国家核物理研究所米兰分部）；Instituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM)（探测与天体粒子技术研究所（阿根廷原子能委员会、国家科学研究委员会、萨米特国立大学））；Sapienza Università di Roma（罗马智慧大学）；Istituto Nazionale di Fisica Nucleare – Sezione di Roma1（意大利国家核物理研究所罗马一分部）；Mohammed VI Polytechnic University（穆罕默德六世理工大学）
