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:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat: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 temperature Notari, Alessio Quartin, Miguel Cosmologia Raigs còsmics Cosmology Cosmic rays 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. American Physical Society https://hdl.handle.net/2445/128220
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
author Notari, Alessio
author_facet Notari, Alessio
Quartin, Miguel
author_role author
author2 Quartin, Miguel
author2_role author
topic Cosmologia
Raigs còsmics
Cosmology
Cosmic rays
topic_facet 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
format article
status_str publishedVersion
url https://hdl.handle.net/2445/128220
eu_rights_str_mv openAccess
publisher American Physical Society
institution Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
collection Recercat. Dipósit de la Recerca de Catalunya
reponame_str Recercat. Dipósit de la Recerca de Catalunya
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
_version_ 1878437969129373696
publishDateSort 2016
author_browse Notari, Alessio
Quartin, Miguel
publisherStr American Physical Society
score 6,924472

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