Planck intermediate results: XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap
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...
Published in: | Astronomy & Astrophysics |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://hdl.handle.net/20.500.11767/69588 https://doi.org/10.1051/0004-6361/201628636 http://www.edpsciences.org/journal/index.cfm?edpsname=aa https://arxiv.org/abs/1604.01029 |
id |
ftsissa:oai:iris.sissa.it:20.500.11767/69588 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
International School for Advanced Studies (SISSA), Trieste: SISSA Digital Library (SDL) |
op_collection_id |
ftsissa |
language |
English |
topic |
Cosmic background radiation Dust extinction ISM: magnetic field Magnetohydrodynamics (MHD) Methods: data analysi Polarization astro-ph.GA Astronomy and Astrophysic Space and Planetary Science Settore FIS/05 - Astronomia e Astrofisica |
spellingShingle |
Cosmic background radiation Dust extinction ISM: magnetic field Magnetohydrodynamics (MHD) Methods: data analysi Polarization astro-ph.GA Astronomy and Astrophysic Space and Planetary Science Settore FIS/05 - Astronomia e Astrofisica 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. Planck intermediate results: XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
topic_facet |
Cosmic background radiation Dust extinction ISM: magnetic field Magnetohydrodynamics (MHD) Methods: data analysi Polarization astro-ph.GA Astronomy and Astrophysic Space and Planetary Science Settore FIS/05 - Astronomia e Astrofisica |
description |
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 (l0,b0) = (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 (p0) 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 p0value 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 can be easily ... |
author2 |
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. |
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. |
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. |
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 |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.11767/69588 https://doi.org/10.1051/0004-6361/201628636 http://www.edpsciences.org/journal/index.cfm?edpsname=aa https://arxiv.org/abs/1604.01029 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000390797900052 volume:596 firstpage:1 lastpage:15 numberofpages:15 journal:ASTRONOMY & ASTROPHYSICS info:eu-repo/grantAgreement/EC/FP7/267934 http://hdl.handle.net/20.500.11767/69588 doi:10.1051/0004-6361/201628636 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85006459080 http://www.edpsciences.org/journal/index.cfm?edpsname=aa https://arxiv.org/abs/1604.01029 |
op_doi |
https://doi.org/20.500.11767/6958810.1051/0004-6361/201628636 |
container_title |
Astronomy & Astrophysics |
container_volume |
596 |
container_start_page |
A105 |
_version_ |
1766202951768997888 |
spelling |
ftsissa:oai:iris.sissa.it:20.500.11767/69588 2023-05-15T18:23:22+02:00 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. 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. 2016 https://hdl.handle.net/20.500.11767/69588 https://doi.org/10.1051/0004-6361/201628636 http://www.edpsciences.org/journal/index.cfm?edpsname=aa https://arxiv.org/abs/1604.01029 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000390797900052 volume:596 firstpage:1 lastpage:15 numberofpages:15 journal:ASTRONOMY & ASTROPHYSICS info:eu-repo/grantAgreement/EC/FP7/267934 http://hdl.handle.net/20.500.11767/69588 doi:10.1051/0004-6361/201628636 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85006459080 http://www.edpsciences.org/journal/index.cfm?edpsname=aa https://arxiv.org/abs/1604.01029 Cosmic background radiation Dust extinction ISM: magnetic field Magnetohydrodynamics (MHD) Methods: data analysi Polarization astro-ph.GA Astronomy and Astrophysic Space and Planetary Science Settore FIS/05 - Astronomia e Astrofisica info:eu-repo/semantics/article 2016 ftsissa https://doi.org/20.500.11767/6958810.1051/0004-6361/201628636 2023-03-21T23:25:26Z 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 (l0,b0) = (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 (p0) 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 p0value 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 can be easily ... Article in Journal/Newspaper South pole International School for Advanced Studies (SISSA), Trieste: SISSA Digital Library (SDL) South Pole Astronomy & Astrophysics 596 A105 |