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...
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ftinstnastrofisi:oai:openaccess.inaf.it:20.500.12386/25261 2023-05-15T18:23:19+02:00 Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap Planck Collaboration 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, CARLO 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, FRANCESCO 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. 2016 https://hdl.handle.net/20.500.12386/25261 https://doi.org/10.1051/0004-6361/201628636 https://www.aanda.org/articles/aa/abs/2016/12/aa28636-16/aa28636-16.html en eng ASTRONOMY & ASTROPHYSICS 0004-6361 http://hdl.handle.net/20.500.12386/25261 doi:10.1051/0004-6361/201628636 2-s2.0-85006459080 000390797900052 https://www.aanda.org/articles/aa/abs/2016/12/aa28636-16/aa28636-16.html 2016A&A.596A.105P open Article 2016 ftinstnastrofisi https://doi.org/20.500.12386/25261 https://doi.org/10.1051/0004-6361/201628636 2022-07-06T15:58:49Z 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 can be easily computed on ... Article in Journal/Newspaper South pole OA@INAF (Istituto Nazionale di Astrofisica) South Pole |
institution |
Open Polar |
collection |
OA@INAF (Istituto Nazionale di Astrofisica) |
op_collection_id |
ftinstnastrofisi |
language |
English |
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 (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 can be easily computed on ... |
format |
Article in Journal/Newspaper |
author |
Planck Collaboration 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, CARLO 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, FRANCESCO 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. |
spellingShingle |
Planck Collaboration 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, CARLO 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, FRANCESCO 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. Planck intermediate results. XLIV. Structure of the Galactic magnetic field from dust polarization maps of the southern Galactic cap |
author_facet |
Planck Collaboration 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, CARLO 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, FRANCESCO 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. |
author_sort |
Planck Collaboration |
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/20.500.12386/25261 https://doi.org/10.1051/0004-6361/201628636 https://www.aanda.org/articles/aa/abs/2016/12/aa28636-16/aa28636-16.html |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
ASTRONOMY & ASTROPHYSICS 0004-6361 http://hdl.handle.net/20.500.12386/25261 doi:10.1051/0004-6361/201628636 2-s2.0-85006459080 000390797900052 https://www.aanda.org/articles/aa/abs/2016/12/aa28636-16/aa28636-16.html 2016A&A.596A.105P |
op_rights |
open |
op_doi |
https://doi.org/20.500.12386/25261 https://doi.org/10.1051/0004-6361/201628636 |
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1766202879077515264 |