Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap
International audience Using data from the Planck satellite, we study the statistical properties of interstellar dust polarization at high Galactic latitudes around the south pole (b < -60°). Our aim is to advance the understanding of the magnetized interstellar medium (ISM), and to provide a mod...
Published in: | Astronomy & Astrophysics |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal.science/hal-03645030 https://hal.science/hal-03645030/document https://hal.science/hal-03645030/file/aa28636-16.pdf https://doi.org/10.1051/0004-6361/201628636 |
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openpolar |
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Archive de l'Observatoire de Paris (HAL) |
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ftobservparis |
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English |
topic |
magnetohydrodynamics (MHD) polarization methods: data analysis dust extinction cosmic background radiation ISM: magnetic fields Astrophysics - Astrophysics of Galaxies [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA] [SDU]Sciences of the Universe [physics] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] |
spellingShingle |
magnetohydrodynamics (MHD) polarization methods: data analysis dust extinction cosmic background radiation ISM: magnetic fields Astrophysics - Astrophysics of Galaxies [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA] [SDU]Sciences of the Universe [physics] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] Aghanim, N. Alves, M. I. R. Arzoumanian, D. Aumont, J. Baccigalupi, C. Ballardini, M. Banday, A. J. Barreiro, R. B. Bartolo, N. Basak, S. Benabed, K. Bernard, J. -P. Bersanelli, M. Bielewicz, P. Bonavera, L. Bond, J. R. Borrill, J. Bouchet, F. R. Boulanger, F. Bracco, A. Bucher, M. Burigana, C. Calabrese, E. Cardoso, J. -F. Chiang, H. C. Colombo, L. P. L. Combet, C. Comis, B. Couchot, F. Coulais, A. Crill, B. P. Curto, A. Cuttaia, F. Davis, R. J. de Bernardis, P. de Rosa, A. de Zotti, G. Delabrouille, J. Delouis, J. -M. Di Valentino, E. Dickinson, C. Diego, J. M. Doré, O. Douspis, M. Ducout, A. Dupac, X. Dusini, S. Efstathiou, G. Elsner, F. Ensslin, T. A. Eriksen, H. K. Falgarone, E. Fantaye, Y. Ferrière, K. Finelli, F. Frailis, M. Fraisse, A. A. Franceschi, E. Frolov, A. Galeotta, S. Galli, S. Ganga, K. Génova-Santos, R. T. Gerbino, M. Ghosh, T. González-Nuevo, J. Górski, K. M. Gratton, S. Gregorio, A. Gruppuso, A. Gudmundsson, J. E. Guillet, V. Hansen, F. K. Helou, G. Henrot-Versillé, S. Herranz, D. Hivon, E. Huang, Z. Jaffe, A. H. Jaffe, T. R. Jones, W. C. Keihänen, E. Keskitalo, R. Kisner, T. S. Krachmalnicoff, N. Kunz, M. Kurki-Suonio, H. Lagache, G. Lähteenmäki, A. Lamarre, J. -M. Langer, M. Lasenby, A. Lattanzi, M. Le Jeune, M. Levrier, F. Liguori, M. Lilje, P. B. López-Caniego, M. Lubin, P. M. Macías-Pérez, J. F. Maggio, G. Maino, D. Mandolesi, N. Mangilli, A. Maris, M. Martin, P. G. Martínez-González, E. Matarrese, S. Mauri, N. Mcewen, J. D. Melchiorri, A. Mennella, A. Migliaccio, M. Miville-Deschênes, M. -A. Molinari, D. Moneti, A. Montier, L. Morgante, G. Moss, A. Naselsky, P. Natoli, P. Neveu, J. Nørgaard-Nielsen, H. U. Oppermann, N. Oxborrow, C. A. Pagano, L. Paoletti, D. Partridge, B. Perdereau, O. Perotto, L. Pettorino, V. Piacentini, F. Plaszczynski, S. Polenta, G. Rachen, J. P. Rebolo, R. Reinecke, M. Remazeilles, M. Renzi, A. Ristorcelli, I. Rocha, G. Rossetti, M. Roudier, G. Ruiz-Granados, B. Salvati, L. Sandri, M. Savelainen, M. Scott, D. Sirignano, C. Soler, J. D. Suur-Uski, A. -S. Tauber, J. A. Tavagnacco, D. Tenti, M. Toffolatti, L. Tomasi, M. Tristram, M. Trombetti, T. Valiviita, J. Vansyngel, F. van Tent, F. Vielva, P. Villa, F. Wandelt, B. D. Wehus, I. K. Zacchei, A. Zonca, A. Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
topic_facet |
magnetohydrodynamics (MHD) polarization methods: data analysis dust extinction cosmic background radiation ISM: magnetic fields Astrophysics - Astrophysics of Galaxies [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA] [SDU]Sciences of the Universe [physics] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] |
description |
International audience Using data from the Planck satellite, we study the statistical properties of interstellar dust polarization at high Galactic latitudes around the south pole (b < -60°). Our aim is to advance the understanding of the magnetized interstellar medium (ISM), and to provide a modelling framework of the polarized dust foreground for use in cosmic microwave background (CMB) component-separation procedures. We examine the Stokes I, Q, and U maps at 353 GHz, and particularly the statistical distribution of the polarization fraction (p) and angle (ψ), in order to characterize the ordered and turbulent components of the Galactic magnetic field (GMF) in the solar neighbourhood. The Q and U maps show patterns at large angular scales, which we relate to the mean orientation of the GMF towards Galactic coordinates (l 0 ,b 0 ) = (70° ± 5°,24° ± 5°). The histogram of the observed p values shows a wide dispersion up to 25%. The histogram of ψ has a standard deviation of 12° about the regular pattern expected from the ordered GMF. We build a phenomenological model that connects the distributions of p and ψ to a statistical description of the turbulent component of the GMF, assuming a uniform effective polarization fraction (p 0 ) of dust emission. To compute the Stokes parameters, we approximate the integration along the line of sight (LOS) as a sum over a set of N independent polarization layers, in each of which the turbulent component of the GMF is obtained from Gaussian realizations of a power-law power spectrum. We are able to reproduce the observed p and ψ distributions using a p 0 value of 26%, a ratio of 0.9 between the strengths of the turbulent and mean components of the GMF, and a small value of N. The mean value of p (inferred from the fit of the large-scale patterns in the Stokes maps) is 12 ± 1%. We relate the polarization layers to the density structure and to the correlation length of the GMF along the LOS. We emphasize the simplicity of our model (involving only a few parameters), which ... |
author2 |
Institut de recherche en astrophysique et planétologie (IRAP) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut d'astrophysique spatiale (IAS) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Université Pierre et Marie Curie - Paris 6 (UPMC) AstroParticule et Cosmologie (APC (UMR_7164)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Physique Subatomique et de Cosmologie (LPSC) Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire de l'Accélérateur Linéaire (LAL) Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Astrophysique de Marseille (LAM) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Physique Théorique d'Orsay Orsay (LPT) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Aghanim, N. Alves, M. I. R. Arzoumanian, D. Aumont, J. Baccigalupi, C. Ballardini, M. Banday, A. J. Barreiro, R. B. Bartolo, N. Basak, S. Benabed, K. Bernard, J. -P. Bersanelli, M. Bielewicz, P. Bonavera, L. Bond, J. R. Borrill, J. Bouchet, F. R. Boulanger, F. Bracco, A. Bucher, M. Burigana, C. Calabrese, E. Cardoso, J. -F. Chiang, H. C. Colombo, L. P. L. Combet, C. Comis, B. Couchot, F. Coulais, A. Crill, B. P. Curto, A. Cuttaia, F. Davis, R. J. de Bernardis, P. de Rosa, A. de Zotti, G. Delabrouille, J. Delouis, J. -M. Di Valentino, E. Dickinson, C. Diego, J. M. Doré, O. Douspis, M. Ducout, A. Dupac, X. Dusini, S. Efstathiou, G. Elsner, F. Ensslin, T. A. Eriksen, H. K. Falgarone, E. Fantaye, Y. Ferrière, K. Finelli, F. Frailis, M. Fraisse, A. A. Franceschi, E. Frolov, A. Galeotta, S. Galli, S. Ganga, K. Génova-Santos, R. T. Gerbino, M. Ghosh, T. González-Nuevo, J. Górski, K. M. Gratton, S. Gregorio, A. Gruppuso, A. Gudmundsson, J. E. Guillet, V. Hansen, F. K. Helou, G. Henrot-Versillé, S. Herranz, D. Hivon, E. Huang, Z. Jaffe, A. H. Jaffe, T. R. Jones, W. C. Keihänen, E. Keskitalo, R. Kisner, T. S. Krachmalnicoff, N. Kunz, M. Kurki-Suonio, H. Lagache, G. Lähteenmäki, A. Lamarre, J. -M. Langer, M. Lasenby, A. Lattanzi, M. Le Jeune, M. Levrier, F. Liguori, M. Lilje, P. B. López-Caniego, M. Lubin, P. M. Macías-Pérez, J. F. Maggio, G. Maino, D. Mandolesi, N. Mangilli, A. Maris, M. Martin, P. G. Martínez-González, E. Matarrese, S. Mauri, N. Mcewen, J. D. Melchiorri, A. Mennella, A. Migliaccio, M. Miville-Deschênes, M. -A. Molinari, D. Moneti, A. Montier, L. Morgante, G. Moss, A. Naselsky, P. Natoli, P. Neveu, J. Nørgaard-Nielsen, H. U. Oppermann, N. Oxborrow, C. A. Pagano, L. Paoletti, D. Partridge, B. Perdereau, O. Perotto, L. Pettorino, V. Piacentini, F. Plaszczynski, S. Polenta, G. Rachen, J. P. Rebolo, R. Reinecke, M. Remazeilles, M. Renzi, A. Ristorcelli, I. Rocha, G. Rossetti, M. Roudier, G. Ruiz-Granados, B. Salvati, L. Sandri, M. Savelainen, M. Scott, D. Sirignano, C. Soler, J. D. Suur-Uski, A. -S. Tauber, J. A. Tavagnacco, D. Tenti, M. Toffolatti, L. Tomasi, M. Tristram, M. Trombetti, T. Valiviita, J. Vansyngel, F. van Tent, F. Vielva, P. Villa, F. Wandelt, B. D. Wehus, I. K. Zacchei, A. Zonca, A. |
author_facet |
Aghanim, N. Alves, M. I. R. Arzoumanian, D. Aumont, J. Baccigalupi, C. Ballardini, M. Banday, A. J. Barreiro, R. B. Bartolo, N. Basak, S. Benabed, K. Bernard, J. -P. Bersanelli, M. Bielewicz, P. Bonavera, L. Bond, J. R. Borrill, J. Bouchet, F. R. Boulanger, F. Bracco, A. Bucher, M. Burigana, C. Calabrese, E. Cardoso, J. -F. Chiang, H. C. Colombo, L. P. L. Combet, C. Comis, B. Couchot, F. Coulais, A. Crill, B. P. Curto, A. Cuttaia, F. Davis, R. J. de Bernardis, P. de Rosa, A. de Zotti, G. Delabrouille, J. Delouis, J. -M. Di Valentino, E. Dickinson, C. Diego, J. M. Doré, O. Douspis, M. Ducout, A. Dupac, X. Dusini, S. Efstathiou, G. Elsner, F. Ensslin, T. A. Eriksen, H. K. Falgarone, E. Fantaye, Y. Ferrière, K. Finelli, F. Frailis, M. Fraisse, A. A. Franceschi, E. Frolov, A. Galeotta, S. Galli, S. Ganga, K. Génova-Santos, R. T. Gerbino, M. Ghosh, T. González-Nuevo, J. Górski, K. M. Gratton, S. Gregorio, A. Gruppuso, A. Gudmundsson, J. E. Guillet, V. Hansen, F. K. Helou, G. Henrot-Versillé, S. Herranz, D. Hivon, E. Huang, Z. Jaffe, A. H. Jaffe, T. R. Jones, W. C. Keihänen, E. Keskitalo, R. Kisner, T. S. Krachmalnicoff, N. Kunz, M. Kurki-Suonio, H. Lagache, G. Lähteenmäki, A. Lamarre, J. -M. Langer, M. Lasenby, A. Lattanzi, M. Le Jeune, M. Levrier, F. Liguori, M. Lilje, P. B. López-Caniego, M. Lubin, P. M. Macías-Pérez, J. F. Maggio, G. Maino, D. Mandolesi, N. Mangilli, A. Maris, M. Martin, P. G. Martínez-González, E. Matarrese, S. Mauri, N. Mcewen, J. D. Melchiorri, A. Mennella, A. Migliaccio, M. Miville-Deschênes, M. -A. Molinari, D. Moneti, A. Montier, L. Morgante, G. Moss, A. Naselsky, P. Natoli, P. Neveu, J. Nørgaard-Nielsen, H. U. Oppermann, N. Oxborrow, C. A. Pagano, L. Paoletti, D. Partridge, B. Perdereau, O. Perotto, L. Pettorino, V. Piacentini, F. Plaszczynski, S. Polenta, G. Rachen, J. P. Rebolo, R. Reinecke, M. Remazeilles, M. Renzi, A. Ristorcelli, I. Rocha, G. Rossetti, M. Roudier, G. Ruiz-Granados, B. Salvati, L. Sandri, M. Savelainen, M. Scott, D. Sirignano, C. Soler, J. D. Suur-Uski, A. -S. Tauber, J. A. Tavagnacco, D. Tenti, M. Toffolatti, L. Tomasi, M. Tristram, M. Trombetti, T. Valiviita, J. Vansyngel, F. van Tent, F. Vielva, P. Villa, F. Wandelt, B. D. Wehus, I. K. Zacchei, A. Zonca, A. |
author_sort |
Aghanim, N. |
title |
Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
title_short |
Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
title_full |
Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
title_fullStr |
Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
title_full_unstemmed |
Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
title_sort |
planck intermediate results. xliv. structure of the galactic magnetic field from dust polarization maps of the southern galactic cap |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-03645030 https://hal.science/hal-03645030/document https://hal.science/hal-03645030/file/aa28636-16.pdf https://doi.org/10.1051/0004-6361/201628636 |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-03645030 Astronomy and Astrophysics - A&A, 2016, 596, pp.A105. ⟨10.1051/0004-6361/201628636⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/1604.01029 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201628636 hal-03645030 https://hal.science/hal-03645030 https://hal.science/hal-03645030/document https://hal.science/hal-03645030/file/aa28636-16.pdf ARXIV: 1604.01029 BIBCODE: 2016A&A.596A.105P doi:10.1051/0004-6361/201628636 INSPIRE: 1443345 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1051/0004-6361/201628636 |
container_title |
Astronomy & Astrophysics |
container_volume |
596 |
container_start_page |
A105 |
_version_ |
1810480676818911232 |
spelling |
ftobservparis:oai:HAL:hal-03645030v1 2024-09-15T18:36:57+00:00 Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap Aghanim, N. Alves, M. I. R. Arzoumanian, D. Aumont, J. Baccigalupi, C. Ballardini, M. Banday, A. J. Barreiro, R. B. Bartolo, N. Basak, S. Benabed, K. Bernard, J. -P. Bersanelli, M. Bielewicz, P. Bonavera, L. Bond, J. R. Borrill, J. Bouchet, F. R. Boulanger, F. Bracco, A. Bucher, M. Burigana, C. Calabrese, E. Cardoso, J. -F. Chiang, H. C. Colombo, L. P. L. Combet, C. Comis, B. Couchot, F. Coulais, A. Crill, B. P. Curto, A. Cuttaia, F. Davis, R. J. de Bernardis, P. de Rosa, A. de Zotti, G. Delabrouille, J. Delouis, J. -M. Di Valentino, E. Dickinson, C. Diego, J. M. Doré, O. Douspis, M. Ducout, A. Dupac, X. Dusini, S. Efstathiou, G. Elsner, F. Ensslin, T. A. Eriksen, H. K. Falgarone, E. Fantaye, Y. Ferrière, K. Finelli, F. Frailis, M. Fraisse, A. A. Franceschi, E. Frolov, A. Galeotta, S. Galli, S. Ganga, K. Génova-Santos, R. T. Gerbino, M. Ghosh, T. González-Nuevo, J. Górski, K. M. Gratton, S. Gregorio, A. Gruppuso, A. Gudmundsson, J. E. Guillet, V. Hansen, F. K. Helou, G. Henrot-Versillé, S. Herranz, D. Hivon, E. Huang, Z. Jaffe, A. H. Jaffe, T. R. Jones, W. C. Keihänen, E. Keskitalo, R. Kisner, T. S. Krachmalnicoff, N. Kunz, M. Kurki-Suonio, H. Lagache, G. Lähteenmäki, A. Lamarre, J. -M. Langer, M. Lasenby, A. Lattanzi, M. Le Jeune, M. Levrier, F. Liguori, M. Lilje, P. B. López-Caniego, M. Lubin, P. M. Macías-Pérez, J. F. Maggio, G. Maino, D. Mandolesi, N. Mangilli, A. Maris, M. Martin, P. G. Martínez-González, E. Matarrese, S. Mauri, N. Mcewen, J. D. Melchiorri, A. Mennella, A. Migliaccio, M. Miville-Deschênes, M. -A. Molinari, D. Moneti, A. Montier, L. Morgante, G. Moss, A. Naselsky, P. Natoli, P. Neveu, J. Nørgaard-Nielsen, H. U. Oppermann, N. Oxborrow, C. A. Pagano, L. Paoletti, D. Partridge, B. Perdereau, O. Perotto, L. Pettorino, V. Piacentini, F. Plaszczynski, S. Polenta, G. Rachen, J. P. Rebolo, R. Reinecke, M. Remazeilles, M. Renzi, A. Ristorcelli, I. Rocha, G. Rossetti, M. Roudier, G. Ruiz-Granados, B. Salvati, L. Sandri, M. Savelainen, M. Scott, D. Sirignano, C. Soler, J. D. Suur-Uski, A. -S. Tauber, J. A. Tavagnacco, D. Tenti, M. Toffolatti, L. Tomasi, M. Tristram, M. Trombetti, T. Valiviita, J. Vansyngel, F. van Tent, F. Vielva, P. Villa, F. Wandelt, B. D. Wehus, I. K. Zacchei, A. Zonca, A. Institut de recherche en astrophysique et planétologie (IRAP) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut d'astrophysique spatiale (IAS) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Institut d'Astrophysique de Paris (IAP) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Université Pierre et Marie Curie - Paris 6 (UPMC) AstroParticule et Cosmologie (APC (UMR_7164)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Physique Subatomique et de Cosmologie (LPSC) Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Laboratoire de l'Accélérateur Linéaire (LAL) Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'Astrophysique de Marseille (LAM) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Physique Théorique d'Orsay Orsay (LPT) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) 2016 https://hal.science/hal-03645030 https://hal.science/hal-03645030/document https://hal.science/hal-03645030/file/aa28636-16.pdf https://doi.org/10.1051/0004-6361/201628636 en eng HAL CCSD EDP Sciences info:eu-repo/semantics/altIdentifier/arxiv/1604.01029 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201628636 hal-03645030 https://hal.science/hal-03645030 https://hal.science/hal-03645030/document https://hal.science/hal-03645030/file/aa28636-16.pdf ARXIV: 1604.01029 BIBCODE: 2016A&A.596A.105P doi:10.1051/0004-6361/201628636 INSPIRE: 1443345 info:eu-repo/semantics/OpenAccess ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-03645030 Astronomy and Astrophysics - A&A, 2016, 596, pp.A105. ⟨10.1051/0004-6361/201628636⟩ magnetohydrodynamics (MHD) polarization methods: data analysis dust extinction cosmic background radiation ISM: magnetic fields Astrophysics - Astrophysics of Galaxies [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA] [SDU]Sciences of the Universe [physics] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/article Journal articles 2016 ftobservparis https://doi.org/10.1051/0004-6361/201628636 2024-06-25T00:01:25Z International audience Using data from the Planck satellite, we study the statistical properties of interstellar dust polarization at high Galactic latitudes around the south pole (b < -60°). Our aim is to advance the understanding of the magnetized interstellar medium (ISM), and to provide a modelling framework of the polarized dust foreground for use in cosmic microwave background (CMB) component-separation procedures. We examine the Stokes I, Q, and U maps at 353 GHz, and particularly the statistical distribution of the polarization fraction (p) and angle (ψ), in order to characterize the ordered and turbulent components of the Galactic magnetic field (GMF) in the solar neighbourhood. The Q and U maps show patterns at large angular scales, which we relate to the mean orientation of the GMF towards Galactic coordinates (l 0 ,b 0 ) = (70° ± 5°,24° ± 5°). The histogram of the observed p values shows a wide dispersion up to 25%. The histogram of ψ has a standard deviation of 12° about the regular pattern expected from the ordered GMF. We build a phenomenological model that connects the distributions of p and ψ to a statistical description of the turbulent component of the GMF, assuming a uniform effective polarization fraction (p 0 ) of dust emission. To compute the Stokes parameters, we approximate the integration along the line of sight (LOS) as a sum over a set of N independent polarization layers, in each of which the turbulent component of the GMF is obtained from Gaussian realizations of a power-law power spectrum. We are able to reproduce the observed p and ψ distributions using a p 0 value of 26%, a ratio of 0.9 between the strengths of the turbulent and mean components of the GMF, and a small value of N. The mean value of p (inferred from the fit of the large-scale patterns in the Stokes maps) is 12 ± 1%. We relate the polarization layers to the density structure and to the correlation length of the GMF along the LOS. We emphasize the simplicity of our model (involving only a few parameters), which ... Article in Journal/Newspaper South pole Archive de l'Observatoire de Paris (HAL) Astronomy & Astrophysics 596 A105 |