• Foreground separation using a...

Treffer: Foreground separation using a flexible maximum-entropy algorithm: an application to COBE data

Title:
Foreground separation using a flexible maximum-entropy algorithm: an application to COBE data
Authors:
BARREIRO, R. B, HOBSON, M. P, BANDAY, A. J, LASENBY, A. N, STOLYAROV, V, VIELVA, P, GORSKI, K. M
Source:
Monthly Notices of the Royal Astronomical Society. 351(2):515-540
Publisher Information:
Oxford: Blackwell Science, 2004.
Publication Year:
2004
Physical Description:
print, 55 ref
Original Material:
INIST-CNRS
Subject Terms:
Astronomy earth cosmic environment, Astronomie et environnement cosmique terrestre, Sciences exactes et technologie, Exact sciences and technology, Terre, ocean, espace, Earth, ocean, space, Astronomie, Astronomy, Astronomie fondamentale et astrophysique. Instrumentation, techniques, et observations astronomiques, Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations, Techniques d'observation et de réduction des données. Simulation et modélisation par ordinateur, Observation and data reduction techniques. Computer modeling and simulation, Méthodes mathématiques et méthodes de simulation sur ordinateur, Mathematical procedures and computer techniques, Systèmes stellaires. Objets et systèmes galactiques et extragalactiques. L'univers, Stellar systems. Galactic and extragalactic objects and systems. The universe, Sources non identifiées de rayonnement à l'extérieur du système solaire, Unidentified sources and radiation outside the solar system, Rayonnements de fond, Background radiations, Algorithme, Algorithms, Analyse donnée, Data analysis, Incertitude, Uncertainty, Incertidumbre, Méthode entropie maximum, Maximum entropy methods, Rayonnement fond cosmique, Cosmic background radiation, cosmic microwave background, methods: data analysis
Document Type:
Fachzeitschrift Article
File Description:
text
Language:
English
Author Affiliations:
Instituto de Física de Cantabria, CSIC-Universidad de Cantabria, Santander, Spain
Astrophysics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, Netherlands
Max-Planck Institut für Astrophysik (MPA), Karl-Schwarzschild Strasse 1, 85740 Garching, Germany
European Southern Observatory (ESO), Karl-Schwarzschild Strasse 2, 85740 Garching, Germany
ISSN:
0035-8711
Access URL:
http://pascal-francis.inist.fr/vibad/index.php?action=search&terms=15864939
Rights:
Copyright 2004 INIST-CNRS
CC BY 4.0
Sauf mention contraire ci-dessus, le contenu de cette notice bibliographique peut être utilisé dans le cadre d’une licence CC BY 4.0 Inist-CNRS / Unless otherwise stated above, the content of this bibliographic record may be used under a CC BY 4.0 licence by Inist-CNRS / A menos que se haya señalado antes, el contenido de este registro bibliográfico puede ser utilizado al amparo de una licencia CC BY 4.0 Inist-CNRS
Notes:
Astronomy
Accession Number:
edscal.15864939
Database:
PASCAL Archive

Weitere Informationen

A flexible maximum-entropy component separation algorithm is presented that accommodates anisotropic noise, incomplete sky-coverage and uncertainties in the spectral parameters of foregrounds. The capabilities of the method are determined by first applying it to simulated spherical microwave data sets emulating the COBE-DMR, COBE-DIRBE and Haslam surveys. Using these simulations we find that is very difficult to determine unambiguously the spectral parameters of the galactic components for this data set due to their high level of noise. Nevertheless, we show that is possible to find a robust cosmic microwave background (CMB) reconstruction, especially at high galactic latitude. The method is then applied to these real data sets to obtain reconstructions of the CMB component and galactic foreground emission over the whole sky. The best reconstructions are found for values of the spectral parameters: Td = 19 K, αd = 2, βff = -0.19 and βsyn = -0.8. The CMB map has been recovered with an estimated statistical error of ∼22 μK on an angular scale of 7° outside the galactic cut, whereas the low galactic latitude region presents contamination from the foreground emissions.