Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment

Autores
Andersson, B. G.; Pintado, Olga Ines; Potter, S.B.; Straiys, V.; Charcos Llorens, M.
Año de publicación
2011
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. Interstellar grain alignment studies are currently experiencing a renaissance due to the development of a new quantitativetheory based on radiative alignment torques (RAT). One of the distinguishing predictions of this theory is a dependence of the grainalignment efficiency on the relative angle (Ψ) between the magnetic field and the anisotropy direction of the radiation field. In anearlier study we found observational evidence for such an effect from observations of the polarization around the star HD 97300 inthe Chamaeleon I cloud. However, due to the large uncertainties in the measured visual extinctions, the result was uncertain.Aims. By acquiring explicit spectral classification of the polarization targets, we have sought to perform a more precise reanalysis ofthe existing polarimetry data.Methods. We have obtained new spectral types for the stars in our for our polarization sample, which we combine with photometricdata from the literature to derive accurate visual extinctions for our sample of background field stars. This allows a high accuracy testof the grain alignment efficiency as a function of Ψ.Results. We confirm and improve the measured accuracy of the variability of the grain alignment efficiency with Ψ, seen in theearlier study. We note that the grain temperature (heating) also shows a dependence on Ψ which we interpret as a natural effect ofthe projection of the grain surface to the illuminating radiation source. This dependence also allows us to derive an estimate of thefraction of aligned grains in the cloud.
Fil: Andersson, B. G.. Usra-sofia Science Center, Nasa; Estados Unidos
Fil: Pintado, Olga Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina
Fil: Potter, S.B.. South African Astronomical Observatory; Sudáfrica
Fil: Straiys, V.. Institut Of Theoretical Physics And Astronomy; Lituania
Fil: Charcos Llorens, M.. Vilnius University; Lituania
Materia
Polarization-Dust
Extinction-Ism
Magnetic Field
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:11336/89410

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network_name_str CONICET Digital (CONICET)
spelling Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignmentAndersson, B. G.Pintado, Olga InesPotter, S.B.Straiys, V.Charcos Llorens, M.Polarization-DustExtinction-IsmMagnetic Fieldhttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1Context. Interstellar grain alignment studies are currently experiencing a renaissance due to the development of a new quantitativetheory based on radiative alignment torques (RAT). One of the distinguishing predictions of this theory is a dependence of the grainalignment efficiency on the relative angle (Ψ) between the magnetic field and the anisotropy direction of the radiation field. In anearlier study we found observational evidence for such an effect from observations of the polarization around the star HD 97300 inthe Chamaeleon I cloud. However, due to the large uncertainties in the measured visual extinctions, the result was uncertain.Aims. By acquiring explicit spectral classification of the polarization targets, we have sought to perform a more precise reanalysis ofthe existing polarimetry data.Methods. We have obtained new spectral types for the stars in our for our polarization sample, which we combine with photometricdata from the literature to derive accurate visual extinctions for our sample of background field stars. This allows a high accuracy testof the grain alignment efficiency as a function of Ψ.Results. We confirm and improve the measured accuracy of the variability of the grain alignment efficiency with Ψ, seen in theearlier study. We note that the grain temperature (heating) also shows a dependence on Ψ which we interpret as a natural effect ofthe projection of the grain surface to the illuminating radiation source. This dependence also allows us to derive an estimate of thefraction of aligned grains in the cloud.Fil: Andersson, B. G.. Usra-sofia Science Center, Nasa; Estados UnidosFil: Pintado, Olga Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; ArgentinaFil: Potter, S.B.. South African Astronomical Observatory; SudáfricaFil: Straiys, V.. Institut Of Theoretical Physics And Astronomy; LituaniaFil: Charcos Llorens, M.. Vilnius University; LituaniaEDP Sciences2011-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/89410Andersson, B. G.; Pintado, Olga Ines; Potter, S.B.; Straiys, V.; Charcos Llorens, M.; Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment; EDP Sciences; Astronomy and Astrophysics; 534; 10-2011; 19-260004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/pdf/2011/10/aa17670-11.pdfinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201117670info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:18:19Zoai:ri.conicet.gov.ar:11336/89410instacron: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:34982025-09-29 10:18:19.459CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
title Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
spellingShingle Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
Andersson, B. G.
Polarization-Dust
Extinction-Ism
Magnetic Field
title_short Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
title_full Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
title_fullStr Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
title_full_unstemmed Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
title_sort Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment
dc.creator.none.fl_str_mv Andersson, B. G.
Pintado, Olga Ines
Potter, S.B.
Straiys, V.
Charcos Llorens, M.
author Andersson, B. G.
author_facet Andersson, B. G.
Pintado, Olga Ines
Potter, S.B.
Straiys, V.
Charcos Llorens, M.
author_role author
author2 Pintado, Olga Ines
Potter, S.B.
Straiys, V.
Charcos Llorens, M.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Polarization-Dust
Extinction-Ism
Magnetic Field
topic Polarization-Dust
Extinction-Ism
Magnetic Field
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. Interstellar grain alignment studies are currently experiencing a renaissance due to the development of a new quantitativetheory based on radiative alignment torques (RAT). One of the distinguishing predictions of this theory is a dependence of the grainalignment efficiency on the relative angle (Ψ) between the magnetic field and the anisotropy direction of the radiation field. In anearlier study we found observational evidence for such an effect from observations of the polarization around the star HD 97300 inthe Chamaeleon I cloud. However, due to the large uncertainties in the measured visual extinctions, the result was uncertain.Aims. By acquiring explicit spectral classification of the polarization targets, we have sought to perform a more precise reanalysis ofthe existing polarimetry data.Methods. We have obtained new spectral types for the stars in our for our polarization sample, which we combine with photometricdata from the literature to derive accurate visual extinctions for our sample of background field stars. This allows a high accuracy testof the grain alignment efficiency as a function of Ψ.Results. We confirm and improve the measured accuracy of the variability of the grain alignment efficiency with Ψ, seen in theearlier study. We note that the grain temperature (heating) also shows a dependence on Ψ which we interpret as a natural effect ofthe projection of the grain surface to the illuminating radiation source. This dependence also allows us to derive an estimate of thefraction of aligned grains in the cloud.
Fil: Andersson, B. G.. Usra-sofia Science Center, Nasa; Estados Unidos
Fil: Pintado, Olga Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina
Fil: Potter, S.B.. South African Astronomical Observatory; Sudáfrica
Fil: Straiys, V.. Institut Of Theoretical Physics And Astronomy; Lituania
Fil: Charcos Llorens, M.. Vilnius University; Lituania
description Context. Interstellar grain alignment studies are currently experiencing a renaissance due to the development of a new quantitativetheory based on radiative alignment torques (RAT). One of the distinguishing predictions of this theory is a dependence of the grainalignment efficiency on the relative angle (Ψ) between the magnetic field and the anisotropy direction of the radiation field. In anearlier study we found observational evidence for such an effect from observations of the polarization around the star HD 97300 inthe Chamaeleon I cloud. However, due to the large uncertainties in the measured visual extinctions, the result was uncertain.Aims. By acquiring explicit spectral classification of the polarization targets, we have sought to perform a more precise reanalysis ofthe existing polarimetry data.Methods. We have obtained new spectral types for the stars in our for our polarization sample, which we combine with photometricdata from the literature to derive accurate visual extinctions for our sample of background field stars. This allows a high accuracy testof the grain alignment efficiency as a function of Ψ.Results. We confirm and improve the measured accuracy of the variability of the grain alignment efficiency with Ψ, seen in theearlier study. We note that the grain temperature (heating) also shows a dependence on Ψ which we interpret as a natural effect ofthe projection of the grain surface to the illuminating radiation source. This dependence also allows us to derive an estimate of thefraction of aligned grains in the cloud.
publishDate 2011
dc.date.none.fl_str_mv 2011-10
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/11336/89410
Andersson, B. G.; Pintado, Olga Ines; Potter, S.B.; Straiys, V.; Charcos Llorens, M.; Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment; EDP Sciences; Astronomy and Astrophysics; 534; 10-2011; 19-26
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/89410
identifier_str_mv Andersson, B. G.; Pintado, Olga Ines; Potter, S.B.; Straiys, V.; Charcos Llorens, M.; Angle-dependent radiative grain alignment: Confirmation of a magnetic field – radiation anisotropy angle dependence on the efficiency of interstellar grain alignment; EDP Sciences; Astronomy and Astrophysics; 534; 10-2011; 19-26
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/pdf/2011/10/aa17670-11.pdf
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201117670
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 EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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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