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Optical modeling of systematic uncertainties in detector polarization angles for the Atacama Cosmology Telescope
Colin C. Murphy, Steve K. Choi, Rahul Datta +10
We present an estimate of the Atacama Cosmology Telescope (ACT) detector polarization angle systematic uncertainty from optics perturbation analysis using polarization-sensitive ra…
The Simons Observatory: Beam characterization for the Small Aperture Telescopes
Nadia Dachlythra, Adriaan J. Duivenvoorden, Jon E. Gudmundsson +27
We use time-domain simulations of Jupiter observations to test and develop a beam reconstruction pipeline for the Simons Observatory Small Aperture Telescopes. The method relies on…
Large-scale power loss in ground-based CMB mapmaking
Sigurd Naess, Thibaut Louis
CMB mapmaking relies on a data model to solve for the sky map, and this process is vulnerable to bias if the data model cannot capture the full behavior of the signal. We demonstra…
Wide Field High Cadence CMB Survey Designs for Chilean Telescopes
Haruki Ebina, Reijo Keskitalo, Julian Borrill +5
We present new wide field survey strategies for Chilean Large Aperture Telescopes (LAT) measuring the Cosmic Microwave Background (CMB), which we call Sinusoidal Modulated High Cad…
The Atacama Cosmology Telescope: Measurement and Analysis of 1D Beams for DR4
Marius Lungu, Emilie R. Storer, Matthew Hasselfield +28
We describe the measurement and treatment of the telescope beams for the Atacama Cosmology Telescope's fourth data release, DR4. Observations of Uranus are used to measure the cent…
The Atacama Cosmology Telescope: DR5 maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data
Sigurd Naess, Simone Aiola, Jason E. Austermann +59
This paper presents a maximum-likelihood algorithm for combining sky maps with disparate sky coverage, angular resolution and spatially varying anisotropic noise into a single map…
The Simons Observatory: Astro2020 Decadal Project Whitepaper
The Simons Observatory Collaboration, Maximilian H. Abitbol, Shunsuke Adachi +280
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) experiment sited on Cerro Toco in the Atacama Desert in Chile that promises to provide breakthrough…
How to avoid X'es around point sources in maximum likelihood CMB maps
Sigurd K. Naess
The maximum likelihood estimator for CMB map-making is optimal and unbiased as long as the data model is correct, but in practice it rarely is, with model errors including sub-pixe…
Time-ordered data simulation and map-making for the PIXIE Fourier transform spectrometer
Sigurd Næss, Jo Dunkley, Alan Kogut +1
We develop a time-ordered data simulator and map-maker for the proposed PIXIE Fourier transform spectrometer and use them to investigate the impact of polarization leakage, imperfe…
Survey strategy optimization for the Atacama Cosmology Telescope
F. De Bernardis, J. R. Stevens, M. Hasselfield +34
In recent years there have been significant improvements in the sensitivity and the angular resolution of the instruments dedicated to the observation of the Cosmic Microwave Backg…
A fast map-making preconditioner for regular scanning patterns
Sigurd Næss, Thibaut Louis
High-resolution Maximum Likelihood map-making of the Cosmic Microwave Background is usually performed using Conjugate Gradients with a preconditioner that ignores noise correlation…
The QUIET Instrument
QUIET Collaboration, C. Bischoff, A. Brizius +52
The Q/U Imaging ExperimenT (QUIET) is designed to measure polarization in the Cosmic Microwave Background, targeting the imprint of inflationary gravitational waves at large angula…
Bayesian noise estimation for non-ideal CMB experiments
I. K. Wehus, S. K. Næss, H. K. Eriksen
We describe a Bayesian framework for estimating the time-domain noise covariance of CMB observations, typically parametrized in terms of a 1/f frequency profile. This framework is…