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Title: A fast map-making preconditioner for regular scanning patterns

Abstract

High-resolution Maximum Likelihood map-making of the Cosmic Microwave Background is usually performed using Conjugate Gradients with a preconditioner that ignores noise correlations. We here present a new preconditioner that approximates the map noise covariance as circulant, and show that this results in a speedup of up to 400% for a realistic scanning pattern from the Atacama Cosmology Telescope. The improvement is especially large for polarized maps.

Authors:
;  [1]
  1. Sub-department of Astrophysics, University of Oxford, Keble Road, Oxford, OX1 3RH (United Kingdom)
Publication Date:
OSTI Identifier:
22373387
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; COSMOLOGY; MAPS; MAXIMUM-LIKELIHOOD FIT; NOISE; RELICT RADIATION; RESOLUTION; TELESCOPES

Citation Formats

Næss, Sigurd K., and Louis, Thibaut, E-mail: sigurd.naess@astro.ox.ac.uk, E-mail: thibaut.louis@astro.ox.ac.uk. A fast map-making preconditioner for regular scanning patterns. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/08/045.
Næss, Sigurd K., & Louis, Thibaut, E-mail: sigurd.naess@astro.ox.ac.uk, E-mail: thibaut.louis@astro.ox.ac.uk. A fast map-making preconditioner for regular scanning patterns. United States. doi:10.1088/1475-7516/2014/08/045.
Næss, Sigurd K., and Louis, Thibaut, E-mail: sigurd.naess@astro.ox.ac.uk, E-mail: thibaut.louis@astro.ox.ac.uk. Fri . "A fast map-making preconditioner for regular scanning patterns". United States. doi:10.1088/1475-7516/2014/08/045.
@article{osti_22373387,
title = {A fast map-making preconditioner for regular scanning patterns},
author = {Næss, Sigurd K. and Louis, Thibaut, E-mail: sigurd.naess@astro.ox.ac.uk, E-mail: thibaut.louis@astro.ox.ac.uk},
abstractNote = {High-resolution Maximum Likelihood map-making of the Cosmic Microwave Background is usually performed using Conjugate Gradients with a preconditioner that ignores noise correlations. We here present a new preconditioner that approximates the map noise covariance as circulant, and show that this results in a speedup of up to 400% for a realistic scanning pattern from the Atacama Cosmology Telescope. The improvement is especially large for polarized maps.},
doi = {10.1088/1475-7516/2014/08/045},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2014,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}