Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz

The detection of point sources in cosmic microwave background maps is usually based on a single-frequency approach, whereby maps at each frequency are filtered separately and the spectral information on the sources is derived combining the results at the different frequencies. In contrast, in the ca...

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Autores: Lanz Oca, Luis Fernando, Herranz Muñoz, Diego|||0000-0003-4540-1417, López-Caniego Alcarria, Marcos, Gonzalez-Nuevo, Joaquín, De Zotti, Gianfranco, Massardi, M., Sanz Estévez, José Luis
Tipo de recurso: artículo
Fecha de publicación:2013
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/25441
Acceso en línea:http://hdl.handle.net/10902/25441
Access Level:acceso abierto
Palabra clave:Methods: data analysis
Techniques: image processing
Surveys
Radio continuum: galaxies
Cosmic background radiation
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spelling Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHzLanz Oca, Luis FernandoHerranz Muñoz, Diego|||0000-0003-4540-1417López-Caniego Alcarria, MarcosGonzalez-Nuevo, JoaquínDe Zotti, GianfrancoMassardi, M.Sanz Estévez, José LuisMethods: data analysisTechniques: image processingSurveysRadio continuum: galaxiesCosmic background radiationThe detection of point sources in cosmic microwave background maps is usually based on a single-frequency approach, whereby maps at each frequency are filtered separately and the spectral information on the sources is derived combining the results at the different frequencies. In contrast, in the case of multifrequency detection methods, source detection and spectral information are tightly interconnected in order to increase the source detection efficiency. In this work we apply the matched multifilter method to the detection of point sources in the Wilkinson Microwave Anisotropy Probe (WMAP) 7-year data at 61 and 94 GHz. This linear filtering technique takes into account the spatial and the cross-power spectrum information at the same time using the spectral behaviour of the sources without making any a priori assumption about it. We follow a two-step approach. First, we do a blind detection of the sources over the whole sky. Secondly, we do a refined local analysis at their positions to improve the signal-to-noise ratio of the detections. At 94 GHz we detect 129 5? objects at |b| > 5° (excluding the Large Magellanic Cloud region); 119 of them are reliable extragalactic sources and 104 of these 119 lie outside the WMAP Point Source Catalogue mask. Nine of the total 129 detections are known Galactic sources or lie in regions of intense Galactic emission and one additional (weak) high Galactic latitude source has no counterpart in low-frequency radio catalogues. Our results constitute a substantial improvement over the New Extragalactic WMAP Point Source (NEWPS) 3-year catalogue.Oxford University PressUniversidad de Cantabria20132013-02-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/25441Monthly Notices of the Royal Astronomical Society, 2013, 428(4), 3048-3057reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/254412026-06-02T12:39:31Z
dc.title.none.fl_str_mv Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
title Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
spellingShingle Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
Lanz Oca, Luis Fernando
Methods: data analysis
Techniques: image processing
Surveys
Radio continuum: galaxies
Cosmic background radiation
title_short Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
title_full Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
title_fullStr Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
title_full_unstemmed Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
title_sort Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
dc.creator.none.fl_str_mv Lanz Oca, Luis Fernando
Herranz Muñoz, Diego|||0000-0003-4540-1417
López-Caniego Alcarria, Marcos
Gonzalez-Nuevo, Joaquín
De Zotti, Gianfranco
Massardi, M.
Sanz Estévez, José Luis
author Lanz Oca, Luis Fernando
author_facet Lanz Oca, Luis Fernando
Herranz Muñoz, Diego|||0000-0003-4540-1417
López-Caniego Alcarria, Marcos
Gonzalez-Nuevo, Joaquín
De Zotti, Gianfranco
Massardi, M.
Sanz Estévez, José Luis
author_role author
author2 Herranz Muñoz, Diego|||0000-0003-4540-1417
López-Caniego Alcarria, Marcos
Gonzalez-Nuevo, Joaquín
De Zotti, Gianfranco
Massardi, M.
Sanz Estévez, José Luis
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Methods: data analysis
Techniques: image processing
Surveys
Radio continuum: galaxies
Cosmic background radiation
topic Methods: data analysis
Techniques: image processing
Surveys
Radio continuum: galaxies
Cosmic background radiation
description The detection of point sources in cosmic microwave background maps is usually based on a single-frequency approach, whereby maps at each frequency are filtered separately and the spectral information on the sources is derived combining the results at the different frequencies. In contrast, in the case of multifrequency detection methods, source detection and spectral information are tightly interconnected in order to increase the source detection efficiency. In this work we apply the matched multifilter method to the detection of point sources in the Wilkinson Microwave Anisotropy Probe (WMAP) 7-year data at 61 and 94 GHz. This linear filtering technique takes into account the spatial and the cross-power spectrum information at the same time using the spectral behaviour of the sources without making any a priori assumption about it. We follow a two-step approach. First, we do a blind detection of the sources over the whole sky. Secondly, we do a refined local analysis at their positions to improve the signal-to-noise ratio of the detections. At 94 GHz we detect 129 5? objects at |b| > 5° (excluding the Large Magellanic Cloud region); 119 of them are reliable extragalactic sources and 104 of these 119 lie outside the WMAP Point Source Catalogue mask. Nine of the total 129 detections are known Galactic sources or lie in regions of intense Galactic emission and one additional (weak) high Galactic latitude source has no counterpart in low-frequency radio catalogues. Our results constitute a substantial improvement over the New Extragalactic WMAP Point Source (NEWPS) 3-year catalogue.
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-02-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/25441
url http://hdl.handle.net/10902/25441
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv Monthly Notices of the Royal Astronomical Society, 2013, 428(4), 3048-3057
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,298079

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