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C-Band All-Sky Survey (C-BASS): Simulated parametric fitting in single pixels in total intensity and polarization

Jew, Luke and Taylor, Angela C. and Jones, Michael E. and Barr, A. and Chiang, H. C. and Dickinson, C. and Grumitt, R. D. P. and Harper, S. E. and Heilgendorff, H. M. and Hill-Valler, J. and Jonas, J. L. and Leahy, J. P. and Leech, J. and Pearson, T. J. and Peel, M. W. and Readhead, A. C. S. and Sievers, J. (2019) C-Band All-Sky Survey (C-BASS): Simulated parametric fitting in single pixels in total intensity and polarization. Monthly Notices of the Royal Astronomical Society, 490 (2). pp. 2958-2975. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20191118-085234230

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Abstract

The cosmic microwave background (CMB) B-mode signal is potentially weaker than the diffuse Galactic foregrounds over most of the sky at any frequency. A common method of separating the CMB from these foregrounds is via pixel-based parametric-model fitting. There are not currently enough all-sky maps to fit anything more than the most simple models of the sky. By simulating the emission in seven representative pixels, we demonstrate that the inclusion of a 5 GHz data point allows for more complex models of low-frequency foregrounds to be fitted than at present. It is shown that the inclusion of the C-BASS data will significantly reduce the uncertainties in a number of key parameters in the modelling of both the galactic foregrounds and the CMB. The extra data allow estimates of the synchrotron spectral index to be constrained much more strongly than is presently possible, with corresponding improvements in the accuracy of the recovery of the CMB amplitude. However, we show that to place good limits on models of the synchrotron spectral curvature will require additional low-frequency data.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stz2697DOIArticle
https://arxiv.org/abs/1907.11642arXivDiscussion Paper
ORCID:
AuthorORCID
Jones, Michael E.0000-0003-3564-6680
Dickinson, C.0000-0002-0045-442X
Pearson, T. J.0000-0001-5213-6231
Peel, M. W.0000-0003-3412-2586
Readhead, A. C. S.0000-0001-9152-961X
Sievers, J.0000-0001-6903-5074
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2019 September 11. Received 2019 September 6; in original form 2019 July 24. Published: 07 October 2019. The C-BASS project is a collaboration between Oxford and Manchester Universities in the UK, the California Institute of Technology in the USA, Rhodes University, University of KwaZulu-Natal and the South African Radio Observatory in South Africa, and the King Abdulaziz City for Science and Technology in Saudi Arabia. It has been supported by the NSF awards AST-0607857, AST-1010024, AST-1212217, and AST-1616227, and NASA award NNX15AF06G, the University of Oxford, the Royal Society, the Science and Technology Facilities Council, and the other participating institutions. This research was also supported by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Technology. Clive Dickinson and Stuart Harper acknowledge support from an STFC Consolidated Grant (ST/P000649/1). Clive Dickinson acknowledges support from an ERC Starting (Consolidator) Grant (no. 307209). Michael Peel acknowledges funding from a FAPESP Young Investigator fellowship, grant 2015/19936-1. We made use of the PYTHON MATPLOTLIB, NUMPY, HEALPY (a python wrapper for the HEALPIX package; Gorski et al. 2005), SCIPY and PYMC packages. (http://cbass.web.ox.ac.uk). The authors would like to thank the anonymous reviewer for their thoughtful comments.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
NSFAST-0607857
NSFAST-1010024
NSFAST-1212217
NSFAST-1616227
NASANNX15AF06G
University of OxfordUNSPECIFIED
Royal SocietyUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/P000649/1
South African Radio Astronomy ObservatoryUNSPECIFIED
National Research Foundation (South Africa)UNSPECIFIED
Department of Science and Technology (South Africa)UNSPECIFIED
European Research Council (ERC)307209
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2015/19936-1
Subject Keywords:methods: statistical – cosmic background radiation – diffuse radiation – radio continuum: general
Issue or Number:2
Record Number:CaltechAUTHORS:20191118-085234230
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191118-085234230
Official Citation:Luke Jew, Angela C Taylor, Michael E Jones, A Barr, H C Chiang, C Dickinson, R D P Grumitt, S E Harper, H M Heilgendorff, J Hill-Valler, J L Jonas, J P Leahy, J Leech, T J Pearson, M W Peel, A C S Readhead, J Sievers, The C-Band All-Sky Survey (C-BASS): Simulated parametric fitting in single pixels in total intensity and polarization, Monthly Notices of the Royal Astronomical Society, Volume 490, Issue 2, December 2019, Pages 2958–2975, https://doi.org/10.1093/mnras/stz2697
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99890
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Nov 2019 18:01
Last Modified:18 Nov 2019 18:01

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