CMB all-scale blackbody distortions induced by linearizing temperature

Cosmic microwave background (CMB) experiments, such as WMAP and Planck, measure intensity anisotropies and build maps using a linearized formula for relating them to the temperature blackbody fluctuations. However, this procedure also generates a signal in the maps in the form of y -type distortions...

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Detalles Bibliográficos
Autores: Notari, Alessio, Quartin, Miguel
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/128220
Acceso en línea:https://hdl.handle.net/2445/128220
Access Level:acceso abierto
Palabra clave:Cosmologia
Raigs còsmics
Cosmology
Cosmic rays
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spelling CMB all-scale blackbody distortions induced by linearizing temperatureNotari, AlessioQuartin, MiguelCosmologiaRaigs còsmicsCosmologyCosmic raysCosmic microwave background (CMB) experiments, such as WMAP and Planck, measure intensity anisotropies and build maps using a linearized formula for relating them to the temperature blackbody fluctuations. However, this procedure also generates a signal in the maps in the form of y -type distortions which is degenerate with the thermal Sunyaev Zel'dovich (tSZ) effect. These are small effects that arise at second order in the temperature fluctuations not from primordial physics but from such a limitation of the map-making procedure. They constitute a contaminant for measurements of our peculiar velocity, the tSZ and primordial y -distortions. They can nevertheless be well modeled and accounted for. We show that the distortions arise from a leakage of the CMB dipole into the y -channel which couples to all multipoles, mostly affecting the range ℓ ≲ 400 . This should be visible in Planck's y -maps with an estimated signal-to-noise ratio of about 12. We note however that such frequency-dependent terms carry no new information on the nature of the CMB dipole. This implies that the real significance of Planck's Doppler coupling measurements is actually lower than reported by the collaboration. Finally, we quantify the level of contamination in tSZ and primordial y -type distortions and show that it is above the sensitivity of proposed next-generation CMB experiments.American Physical Society2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/128220Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1103/PhysRevD.94.043006Physical Review D, 2016, vol. 94, num. 4, p. 043006https://doi.org/10.1103/PhysRevD.94.043006(c) American Physical Society, 2016info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1282202026-05-27T06:46:51Z
dc.title.none.fl_str_mv CMB all-scale blackbody distortions induced by linearizing temperature
title CMB all-scale blackbody distortions induced by linearizing temperature
spellingShingle CMB all-scale blackbody distortions induced by linearizing temperature
Notari, Alessio
Cosmologia
Raigs còsmics
Cosmology
Cosmic rays
title_short CMB all-scale blackbody distortions induced by linearizing temperature
title_full CMB all-scale blackbody distortions induced by linearizing temperature
title_fullStr CMB all-scale blackbody distortions induced by linearizing temperature
title_full_unstemmed CMB all-scale blackbody distortions induced by linearizing temperature
title_sort CMB all-scale blackbody distortions induced by linearizing temperature
dc.creator.none.fl_str_mv Notari, Alessio
Quartin, Miguel
author Notari, Alessio
author_facet Notari, Alessio
Quartin, Miguel
author_role author
author2 Quartin, Miguel
author2_role author
dc.subject.none.fl_str_mv Cosmologia
Raigs còsmics
Cosmology
Cosmic rays
topic Cosmologia
Raigs còsmics
Cosmology
Cosmic rays
description Cosmic microwave background (CMB) experiments, such as WMAP and Planck, measure intensity anisotropies and build maps using a linearized formula for relating them to the temperature blackbody fluctuations. However, this procedure also generates a signal in the maps in the form of y -type distortions which is degenerate with the thermal Sunyaev Zel'dovich (tSZ) effect. These are small effects that arise at second order in the temperature fluctuations not from primordial physics but from such a limitation of the map-making procedure. They constitute a contaminant for measurements of our peculiar velocity, the tSZ and primordial y -distortions. They can nevertheless be well modeled and accounted for. We show that the distortions arise from a leakage of the CMB dipole into the y -channel which couples to all multipoles, mostly affecting the range ℓ ≲ 400 . This should be visible in Planck's y -maps with an estimated signal-to-noise ratio of about 12. We note however that such frequency-dependent terms carry no new information on the nature of the CMB dipole. This implies that the real significance of Planck's Doppler coupling measurements is actually lower than reported by the collaboration. Finally, we quantify the level of contamination in tSZ and primordial y -type distortions and show that it is above the sensitivity of proposed next-generation CMB experiments.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/128220
url https://hdl.handle.net/2445/128220
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.94.043006
Physical Review D, 2016, vol. 94, num. 4, p. 043006
https://doi.org/10.1103/PhysRevD.94.043006
dc.rights.none.fl_str_mv (c) American Physical Society, 2016
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Physical Society, 2016
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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