Fast and precise map-making for massively multi-detector CMB experiments

Abstract

Future cosmic microwave background (CMB) polarisation experiments aim to measure an unprecedentedly small signal - the primordial gravity wave component of the polarisation field B-mode. To achieve this, they will analyse huge datasets, involving years worth of time-ordered data (TOD) from massively multi-detector focal planes. This creates the need for fast and precise methods to complement the M-L approach in analysis pipelines. In this paper, we investigate fast map-making methods as applied to long duration, massively multi-detector, ground-based experiments, in the context of the search for B-modes. We focus on two alternative map-making approaches: destriping and TOD filtering, comparing their performance on simulated multi-detector polarisation data. We have written an optimised, parallel destriping code, the DEStriping CARTographer DESCART, that is generalised for massive focal planes, including the potential effect of cross-correlated TOD 1/f noise. We also determine the scaling of computing time for destriping as applied to a simulated full-season data-set for a realistic experiment. We find that destriping can out-perform filtering in estimating both the large-scale E and B-mode angular power spectra. In particular, filtering can produce significant spurious B-mode power via EB mixing. Whilst this can be removed, it contributes to the variance of B-mode bandpower estimates at scales near the primordial B-mode peak. For the experimental configuration we simulate, this has an effect on the possible detection significance for primordial B-modes. Destriping is a viable alternative fast method to the full M-L approach that does not cause the problems associated with filtering, and is flexible enough to fit into both M-L and Monte-Carlo pseudo-Cl pipelines.

16 pages, 14 figures. MNRAS accepted. Typos corrected and computing time/memory requirement orders-of-magnitude numbers in section 4 replaced by precise numbers

References in corpus (12)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
• Improved measurements of the temperature and polarization of the CMB from QUaD
• Measurement of Cosmic Microwave Background Polarization Power Spectra from Two Years of BICEP Data
• Optical Design of the Atacama Cosmology Telescope and the Millimeter Bolometric Array Camera
• Sunyaev-Zel'dovich Cluster Profiles Measured with the South Pole Telescope
• SANEPIC: A Map-Making Method for Timestream Data From Large Arrays
• Characterization of the BICEP Telescope for High-Precision Cosmic Microwave Background Polarimetry
• Making sky maps from Planck data
• Making CMB temperature and polarization maps with Madam
• Spider Optimization: Probing the Systematics of a Large Scale B-Mode Experiment
• Map-making in small field modulated CMB polarisation experiments: approximating the maximum-likelihood method
• Sunyaev-Zel'dovich Effect Observations of the Bullet Cluster (1E 0657-56) with APEX-SZ

Cited by in corpus (20)

• COMAP Early Science: I. Overview
• The C-Band All-Sky Survey (C-BASS): Design and capabilities
• Impact of Simulated 1/f Noise for HI Intensity Mapping Experiments
• HI intensity mapping with MeerKAT: 1/f noise analysis
• C-Band All-Sky Survey: A First Look at the Galaxy
• The C-Band All-Sky Survey (C-BASS): Design and implementation of the northern receiver
• Iterative destriping and photometric calibration for Planck-HFI, polarized, multi-detector map-making
• Optimal scan strategies for future CMB satellite experiments
• BoloCalc: a sensitivity calculator for the design of Simons Observatory
• COMAP Early Science: VI. A First Look at the COMAP Galactic Plane Survey
• The C-Band All-Sky Survey (C-BASS): Template Fitting of Diffuse Galactic Microwave Emission in the Northern Sky
• Designs for next generation CMB survey strategies from Chile
• The C-Band All-Sky Survey (C-BASS): Constraining diffuse Galactic radio emission in the North Celestial Pole region
• 1/f Noise Analysis for FAST HI Intensity Mapping Drift-Scan Experiment
• The PICASSO map-making code: application to a simulation of the QUIJOTE northern sky survey
• The C-Band All-Sky Survey (C-BASS): New Constraints on the Integrated Radio Spectrum of M 31
• MAPPRAISER: A massively parallel map-making framework for multi-kilo pixel CMB experiments
• A fast map-making preconditioner for regular scanning patterns
• Constraining the Anomalous Microwave Emission Mechanism in the S140 Star Forming Region with Spectroscopic Observations Between 4 and 8 GHz at the Green Bank Telescope
• Spin-based removal of instrumental systematics in 21cm intensity mapping surveys