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Extragalactic foreground contamination in temperature-based CMB lens reconstruction

Osborne, Stephen J. and Hanson, Duncan and Doré, Olivier (2014) Extragalactic foreground contamination in temperature-based CMB lens reconstruction. Journal of Cosmology and Astroparticle Physics, 2014 (3). Art. No. 024. ISSN 1475-7516.

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We discuss the effect of unresolved point source contamination on estimates of the CMB lensing potential, from components such as the thermal Sunyaev-Zel'dovich effect, radio point sources, and the Cosmic Infrared Background. We classify the possible trispectra associated with such source populations, and construct estimators for the amplitude and scale-dependence of several of the major trispectra. We show how to propagate analytical models for these source trispectra to biases for lensing. We also construct a "source-hardened" lensing estimator which experiences significantly smaller biases when exposed to unresolved point sources than the standard quadratic lensing estimator. We demonstrate these ideas in practice using the sky simulations of Sehgal et al., for cosmic-variance limited experiments designed to mimic ACT, SPT, and Planck. We find that for radio sources and SZ the bias is significantly reduced, but for CIB it is essentially unchanged. However, by using the high-frequency, all-sky CIB measurements from Planck and Herschel it may be possible to suppress this contribution.

Item Type:Article
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URLURL TypeDescription Paper
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2014 IOP Publishing Ltd and Sissa Medialab srl. Received November 4, 2013; Accepted February 24, 2014; Published March 13, 2014. SJO acknowledges support from the US Planck Project, which is funded by the NASA Science Mission Directorate. Part of the research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. Some of the results in this paper have been derived using the HEALPix [23] package.
Funding AgencyGrant Number
Subject Keywords:non-gaussianity; gravitational waves and CMBR polarization; CMBR experiments; CMBR theory
Issue or Number:3
Classification Code:PACS: 98.70.Vc; 98.62.Sb; 98.70.Dk
Record Number:CaltechAUTHORS:20140528-132542648
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Official Citation:Extragalactic foreground contamination in temperature-based CMB lens reconstruction Stephen J. Osborne et al JCAP03(2014)024
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45941
Deposited By: Tony Diaz
Deposited On:28 May 2014 21:42
Last Modified:03 Oct 2019 06:38

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