Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques

ABSTRACT: The observation and analysis of the Cosmic Microwave Background Radiation is a crucial task to understand the early Universe. When observing this radiation, we can also see other components of both Galactic and extragalactic origin, and instrumental noise. Our knowledge of the extragalacti...

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Detalles Bibliográficos
Autor: Lanz Oca, Luis Fernando
Tipo de recurso: tesis doctoral
Fecha de publicación:2016
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/8294
Acceso en línea:http://hdl.handle.net/10902/8294
Access Level:acceso abierto
Palabra clave:Fondo cósmico de microondas
Fuentes extragalácticas
Multifiltro
Cosmic microwave background
Extragalactic sources
Multifilter
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spelling Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniquesDetección de fuentes extragalácticas en mapas de la radiación del fondo cósmico de microondas mediante técnicas multifrecuencialesLanz Oca, Luis FernandoFondo cósmico de microondasFuentes extragalácticasMultifiltroCosmic microwave backgroundExtragalactic sourcesMultifilterABSTRACT: The observation and analysis of the Cosmic Microwave Background Radiation is a crucial task to understand the early Universe. When observing this radiation, we can also see other components of both Galactic and extragalactic origin, and instrumental noise. Our knowledge of the extragalactic sources is quite poor in the frequency range between 20 and 1000 GHz. The goal of this thesis is to adapt the matched multifilter (Herranz et al., 2002, MNRAS, 336, 1057) to detect extragalactic sources, because by using several frequencies in a simultaneous way, it uses more information from the data than the single-frequency methods, increasing its performance. The multifilter is applied to realistic simulations of Planck (Lanz et al., 2010, MNRAS, 403, 2120), comparing the results with the obtained by applying the single-frequency matched filter. The multifilter detects more objects and less spurious artifacts. The application of the multifilter to real data of WMAP at 61 and 94 GHz (Lanz et al., 2013, MNRAS, 428, 3048) results in an improvement of the number of detections of ~5 times with respect to other previous works with single-frequency methods, observing a steepening in the spectral behaviour of the sources above ~70 GHz.RESUMEN: La observación y análisis de la Radiación de Fondo Cósmico de Microondas es esencial para tratar de entender el universo temprano. Al observar dicha radiación se puede apreciar que junto a ella, aparecen otras de origen galáctico, extragaláctico y ruido, siendo nuestro conocimiento de las fuentes extragalácticas bastante pobre en el rango de frecuencias entre 20 y 1000 GHz. El objetivo de esta tesis es adaptar el multifiltro adaptado (Herranz et al., 2002, MNRAS, 336, 1057) para la detección de las fuentes extragalácticas, pues al filtrar varias frecuencias simultáneamente, usa mayor cantidad de información de los datos para detectar dichas fuentes que los métodos monofrecuenciales y aumentarán sus prestaciones. El multifiltro se aplicará a simulaciones realistas de la misión Planck (ver Lanz et al., 2010, MNRAS, 403, 2120), comparando los resultados con los obtenidos con el filtro adaptado, su equivalente en una sola frecuencia. El multifiltro detecta más objetos e introduce menos espurias, siendo su fiabilidad más alta. Su aplicación en datos reales de WMAP a 61 y 94 GHz (ver Lanz et al., 2013, MNRAS, 428, 3048) nos muestra que el número de detecciones es unas 5 veces superior a otros trabajos similares con métodos monofrecuenciales, apreciándose un comportamiento espectral de tipo steepening por encima de ~70 GHz.Herranz Muñoz, DiegoLópez-Caniego Alcarria, MarcosUniversidad de Cantabria20162016-02-08doctoral thesishttp://purl.org/coar/resource_type/c_db06NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/doctoralThesishttp://hdl.handle.net/10902/8294reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/82942026-06-02T12:39:31Z
dc.title.none.fl_str_mv Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
Detección de fuentes extragalácticas en mapas de la radiación del fondo cósmico de microondas mediante técnicas multifrecuenciales
title Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
spellingShingle Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
Lanz Oca, Luis Fernando
Fondo cósmico de microondas
Fuentes extragalácticas
Multifiltro
Cosmic microwave background
Extragalactic sources
Multifilter
title_short Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
title_full Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
title_fullStr Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
title_full_unstemmed Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
title_sort Detection of extragalactic sources in cosmic microwave background maps with multifrequency techniques
dc.creator.none.fl_str_mv Lanz Oca, Luis Fernando
author Lanz Oca, Luis Fernando
author_facet Lanz Oca, Luis Fernando
author_role author
dc.contributor.none.fl_str_mv Herranz Muñoz, Diego
López-Caniego Alcarria, Marcos
Universidad de Cantabria
dc.subject.none.fl_str_mv Fondo cósmico de microondas
Fuentes extragalácticas
Multifiltro
Cosmic microwave background
Extragalactic sources
Multifilter
topic Fondo cósmico de microondas
Fuentes extragalácticas
Multifiltro
Cosmic microwave background
Extragalactic sources
Multifilter
description ABSTRACT: The observation and analysis of the Cosmic Microwave Background Radiation is a crucial task to understand the early Universe. When observing this radiation, we can also see other components of both Galactic and extragalactic origin, and instrumental noise. Our knowledge of the extragalactic sources is quite poor in the frequency range between 20 and 1000 GHz. The goal of this thesis is to adapt the matched multifilter (Herranz et al., 2002, MNRAS, 336, 1057) to detect extragalactic sources, because by using several frequencies in a simultaneous way, it uses more information from the data than the single-frequency methods, increasing its performance. The multifilter is applied to realistic simulations of Planck (Lanz et al., 2010, MNRAS, 403, 2120), comparing the results with the obtained by applying the single-frequency matched filter. The multifilter detects more objects and less spurious artifacts. The application of the multifilter to real data of WMAP at 61 and 94 GHz (Lanz et al., 2013, MNRAS, 428, 3048) results in an improvement of the number of detections of ~5 times with respect to other previous works with single-frequency methods, observing a steepening in the spectral behaviour of the sources above ~70 GHz.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-02-08
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/8294
url http://hdl.handle.net/10902/8294
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
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
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
Atribución-NoComercial-SinDerivadas 3.0 España
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eu_rights_str_mv openAccess
dc.source.none.fl_str_mv 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
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