Progress report on the Large Scale Polarization Explorer
L. Lamagna, G. Addamo, P. A. R. Ade, C. Baccigalupi, A. M. Baldini, P. M. Battaglia, E. Battistelli, A. Baù, M. Bersanelli, M. Biasotti, C. Boragno, A. Boscaler… 展开作者
L. Lamagna, G. Addamo, P. A. R. Ade, C. Baccigalupi, A. M. Baldini, P. M. Battaglia, E. Battistelli, A. Baù, M. Bersanelli, M. Biasotti, C. Boragno, A. Boscaleri, B. Caccianiga, S. Caprioli, F. Cavaliere, F. Cei, K. A. Cleary, F. Columbro, G. Coppi, A. Coppolecchia, D. Corsini, F. Cuttaia, G. D'Alessandro, P. de Bernardis, G. De Gasperis, M. De Petris, F. Del Torto, V. Fafone, Z. Farooqui, F. Farsian, F. Fontanelli, C. Franceschet, T. C. Gaier, F. Gatti, R. Genova-Santos, M. Gervasi, T. Ghigna, M. Grassi, D. Grosso, R. Gualtieri, F. Incardona, M. Jones, P. Kangaslahti, N. Krachmalnicoff, R. Mainini, D. Maino, S. Mandelli, M. Maris, S. Masi, S. Matarrese, A. May, P. Mena, A. Mennella, R. Molina, D. Molinari, G. Morgante, F. Nati, P. Natoli, L. Pagano, A. Paiella, F. Paonessa, A. Passerini, M. Perez-de-Taoro, O. A. Peverini, F. Pezzotta, F. Piacentini, L. Piccirillo, G. Pisano, L. Polastri, G. Polenta, D. Poletti, G. Presta, S. Realini, N. Reyes, A. Rocchi, J. A. Rubiño-Martin, M. Sandri, S. Sartor, A. Schillaci, G. Signorelli, B. Siri, M. Soria, F. Spinella, V. Tapia, A. Tartari, A. Taylor, L. Terenzi, M. Tomasi, E. Tommasi, C. Tucker, D. Vaccaro, D. M. Vigano, F. Villa, G. Virone, N. Vittorio, A. Volpe, B. Watkins, A. Zacchei, M. Zannoni
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8 pages, 5 figures, Accepted for publication in Journal of Low Temperature Physics
The Large Scale Polarization Explorer (LSPE) is a cosmology program for the measurement of large scale curl-like features (B-modes) in the polarization of the Cosmic Microwave Background. Its goal is to constrain the background of inflationary gravity waves traveling through the universe at the time of matter-radiation decoupling. The two instruments of LSPE are meant to synergically operate by covering a large portion of the northern microwave sky. LSPE/STRIP is a coherent array of receivers planned to be operated from the Teide Observatory in Tenerife, for the control and characterization of the low-frequency polarized signals of galactic origin; LSPE/SWIPE is a balloon-borne bolometric polarimeter based on 330 large throughput multi-moded detectors, designed to measure the CMB polarization at 150 GHz and to monitor the polarized emission by galactic dust above 200 GHz. The combined performance and the expected level of systematics mitigation will allow LSPE to constrain primordial B-modes down to a tensor/scalar ratio of $10^{-2}$. We here report the status of the STRIP pre-commissioning phase and the progress in the characterization of the key subsystems of the SWIPE payload (namely the cryogenic polarization modulation unit and the multi-moded TES pixels) prior to receiver integration.
[Abridged] The measurement of the polarization of the Cosmic Microwave Background radiation is one of the current frontiers in cosmology. In particular, the detection of the primordial B-modes, could reveal the presence of gravitational waves in the early Universe. The detection of such component is at the moment the most promising technique to probe the inflationary theory describing the very early evolution of the Universe. We present the updated performance forecast of the Large Scale Polarization Explorer (LSPE), a program dedicated to the measurement of the CMB polarization. LSPE is compo…
The Primordial Inflation Explorer (PIXIE) is an Explorer-class mission concept to measure cosmological signals from both linear polarization of the cosmic microwave background and spectral distortions from a perfect blackbody. The targeted measurement sensitivity is 2--4 orders of magnitude below competing astrophysical foregrounds, placing stringent requirements on instrument calibration. An on-board blackbody calibrator presents a polarizing Fourier transform spectrometer with a known signal to enable conversion of the sampled interference fringe patterns from telemetry units to physical uni…
The STRIP instrument of the Large Scale Polarization Explorer: microwave eyes to map the Galactic polarized foregrounds
本文讨论了“大尺度偏振探测器”（LSPE）实验中STRIP仪器的最新进展。LSPE是一个新颖的项目，它结合了地基（STRIP）和球载（SWIPE）的大角度尺度上的微波天空的偏振测量，试图探测宇宙微波背景偏振的“B模式”。STRIP将从特内里费岛的“Observatorio del Teide”观测大约25%的北方天空，使用43 GHz的49个相干偏振仪阵列，与1.5米全旋转交叉Dragone望远镜耦合。第二个频道有六个单元，频率为95千兆赫，将用作大气监测器。目前，STRIP仪器的大部分硬件已经在子系统级开发和测试。从2018年7月开始的系统级表征将使STRIP在年底内在观测站进行运输和安装。整个仪器的现场检定和校准将为STRIP进行为期2年的CMB偏振观测做好准备。
Measuring the faint polarization signal of the cosmic microwave background (CMB) not only requires high optical throughput and instrument sensitivity but also control over systematic effects. Polarimetric cameras or receivers used in this setting often employ dielectric vacuum windows, filters, or lenses to appropriately prepare light for detection by cooled sensor arrays. These elements in the optical chain are typically designed to minimize reflective losses and hence improve sensitivity while minimizing potential imaging artifacts such as glint and ghosting. The Primordial Inflation Polariz…
A Pipeline for the AI-Assisted Analysis of Imaging X-ray Polarimetry Explorer Observations of Black Hole X-ray Binaries and Limits on Their Polarization Variability
Washington University in St. Louis（华盛顿大学圣路易斯分校）；Washington University in St. Louis McDonnell Center for the Space Sciences and Center for Quantum Leaps（华盛顿大学圣路易斯分校麦克唐纳空间科学中心与量子跃迁中心）
ixpeobssim is a simulation and analysis framework, based on the Python programming language and the associated scientific ecosystem, specifically developed for the Imaging X-ray Polarimetry Explorer (IXPE). Given a source model and the response functions of the telescopes, it is designed to produce realistic simulated observations, in the form of event lists in FITS format, containing a strict super-set of the information provided by standard IXPE level-2 files. The core ixpeobssim simulation capabilities are complemented by a full suite of post-processing applications, allowing for the implem…
Stanford University（斯坦福大学）；Department of Physics, Stanford University（斯坦福大学物理系）；Kavli Institute for Particle Astrophysics and Cosmology, Stanford University（斯坦福大学卡弗里粒子天体物理学与宇宙学研究所）
We report the first measurement of the zodiacal light (ZL) polarization spectrum in the near-infrared between 0.8 and 1.8 $μ$m. Using the low-resolution spectrometer (LRS) on board the Cosmic Infrared Background Experiment (CIBER), calibrated for absolute spectrophotometry and spectropolarimetry, we acquire long-slit polarization spectral images of the total diffuse sky brightness towards five fields. To extract the ZL spectrum, we subtract contribution of other diffuse radiation, such as the diffuse galactic light (DGL), the integrated star light (ISL), and the extragalactic background light …
