Spectral index variations of galactic emission

Autores
Testori, Juan Carlos; Reich, Patricia; Reich, Wolfgang
Año de publicación
2004
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have used all-sky maps at 45 MHz, 408 MHz, 1420 MHz and 22.8 GHz to calculate the distribution of spectral indices across the sky. This requires an adjustment of the adopted zero-levels of the different surveys, which was performed by temperature-versus-temperature (TT) plots. While at high frequencies a spectral steepening with increasing Galactic latitude is seen in the same way as it is observed in nearby galaxies seen edge-on, the spectral index distribution is more complex at lower frequencies. In general there is an agreement with the cooling-convection halo models by Lerche & Schlickeiser (1982), but also local magnetic field variations and variations of the cosmic-ray electron energy spectrum may explain the distribution of low-frequency spectral indices.
Fil: Testori, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Reich, Patricia. Max Planck Institut für Radioastronomie; Alemania
Fil: Reich, Wolfgang. Max Planck Institut für Radioastronomie; Alemania
Materia
Galactic Emission
Spectral Index
Surveys
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/29732
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/29732
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Spectral index variations of galactic emissionTestori, Juan CarlosReich, PatriciaReich, WolfgangGalactic EmissionSpectral IndexSurveyshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We have used all-sky maps at 45 MHz, 408 MHz, 1420 MHz and 22.8 GHz to calculate the distribution of spectral indices across the sky. This requires an adjustment of the adopted zero-levels of the different surveys, which was performed by temperature-versus-temperature (TT) plots. While at high frequencies a spectral steepening with increasing Galactic latitude is seen in the same way as it is observed in nearby galaxies seen edge-on, the spectral index distribution is more complex at lower frequencies. In general there is an agreement with the cooling-convection halo models by Lerche & Schlickeiser (1982), but also local magnetic field variations and variations of the cosmic-ray electron energy spectrum may explain the distribution of low-frequency spectral indices.Fil: Testori, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Reich, Patricia. Max Planck Institut für Radioastronomie; AlemaniaFil: Reich, Wolfgang. Max Planck Institut für Radioastronomie; AlemaniaCopernicus GmbH, Katlenburg-Lindau2004-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/29732Testori, Juan Carlos; Reich, Patricia; Reich, Wolfgang; Spectral index variations of galactic emission; Copernicus GmbH, Katlenburg-Lindau; Proceedings of the Magnetized Interstellar Medium; 1; 12-2004; 63-68CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2004mim..proc...63Rinfo:eu-repo/semantics/altIdentifier/url/http://articles.adsabs.harvard.edu/full/2004mim..proc...63Rinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:04:43Zoai:ri.conicet.gov.ar:11336/29732instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:04:43.725CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Spectral index variations of galactic emission
title Spectral index variations of galactic emission
spellingShingle Spectral index variations of galactic emission
Testori, Juan Carlos
Galactic Emission
Spectral Index
Surveys
title_short Spectral index variations of galactic emission
title_full Spectral index variations of galactic emission
title_fullStr Spectral index variations of galactic emission
title_full_unstemmed Spectral index variations of galactic emission
title_sort Spectral index variations of galactic emission
dc.creator.none.fl_str_mv Testori, Juan Carlos
Reich, Patricia
Reich, Wolfgang
author Testori, Juan Carlos
author_facet Testori, Juan Carlos
Reich, Patricia
Reich, Wolfgang
author_role author
author2 Reich, Patricia
Reich, Wolfgang
author2_role author
author
dc.subject.none.fl_str_mv Galactic Emission
Spectral Index
Surveys
topic Galactic Emission
Spectral Index
Surveys
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We have used all-sky maps at 45 MHz, 408 MHz, 1420 MHz and 22.8 GHz to calculate the distribution of spectral indices across the sky. This requires an adjustment of the adopted zero-levels of the different surveys, which was performed by temperature-versus-temperature (TT) plots. While at high frequencies a spectral steepening with increasing Galactic latitude is seen in the same way as it is observed in nearby galaxies seen edge-on, the spectral index distribution is more complex at lower frequencies. In general there is an agreement with the cooling-convection halo models by Lerche & Schlickeiser (1982), but also local magnetic field variations and variations of the cosmic-ray electron energy spectrum may explain the distribution of low-frequency spectral indices.
Fil: Testori, Juan Carlos. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Reich, Patricia. Max Planck Institut für Radioastronomie; Alemania
Fil: Reich, Wolfgang. Max Planck Institut für Radioastronomie; Alemania
description We have used all-sky maps at 45 MHz, 408 MHz, 1420 MHz and 22.8 GHz to calculate the distribution of spectral indices across the sky. This requires an adjustment of the adopted zero-levels of the different surveys, which was performed by temperature-versus-temperature (TT) plots. While at high frequencies a spectral steepening with increasing Galactic latitude is seen in the same way as it is observed in nearby galaxies seen edge-on, the spectral index distribution is more complex at lower frequencies. In general there is an agreement with the cooling-convection halo models by Lerche & Schlickeiser (1982), but also local magnetic field variations and variations of the cosmic-ray electron energy spectrum may explain the distribution of low-frequency spectral indices.
publishDate 2004
dc.date.none.fl_str_mv 2004-12
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/29732
Testori, Juan Carlos; Reich, Patricia; Reich, Wolfgang; Spectral index variations of galactic emission; Copernicus GmbH, Katlenburg-Lindau; Proceedings of the Magnetized Interstellar Medium; 1; 12-2004; 63-68
CONICET Digital
CONICET
url http://hdl.handle.net/11336/29732
identifier_str_mv Testori, Juan Carlos; Reich, Patricia; Reich, Wolfgang; Spectral index variations of galactic emission; Copernicus GmbH, Katlenburg-Lindau; Proceedings of the Magnetized Interstellar Medium; 1; 12-2004; 63-68
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2004mim..proc...63R
info:eu-repo/semantics/altIdentifier/url/http://articles.adsabs.harvard.edu/full/2004mim..proc...63R
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Copernicus GmbH, Katlenburg-Lindau
publisher.none.fl_str_mv Copernicus GmbH, Katlenburg-Lindau
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.982451

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