Planck intermediate results: L. Evidence of spatial variation of the polarized thermal dust spectral energy distribution and implications for CMB B-mode analysis

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Planck intermediate results : L. Evidence of spatial variation of the polarized thermal dust spectral energy distribution and implications for CMB B-mode analysis. / Planck Collaboration.

In: Astronomy and Astrophysics, Vol. 599, A51, 01.03.2017.

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@article{81fc03156ee6422f9a66cec2592b93ef,
title = "Planck intermediate results: L. Evidence of spatial variation of the polarized thermal dust spectral energy distribution and implications for CMB B-mode analysis",
abstract = "The characterization of the Galactic foregrounds has been shown to be the main obstacle in thechallenging quest to detect primordial B-modes in the polarized microwave sky. We make use of the Planck-HFI 2015 data release at high frequencies to place new constraints on the properties of the polarized thermal dust emission at high Galactic latitudes. Here, we specifically study the spatial variability of the dust polarized spectral energy distribution (SED), and its potential impact on the determination of the tensor-to-scalar ratio, r. We use the correlation ratio of the angular power spectra between the 217 and 353 GHz channels as a tracer of these potential variations, computed on different high Galactic latitude regions, ranging from 80{\%} to 20{\%} of the sky. The new insight from Planck data is a departure of the correlation ratio from unity that cannot be attributed to a spurious decorrelation due to the cosmic microwave background, instrumental noise, or instrumental systematics. The effect is marginally detected on each region, but the statistical combination of all the regions gives more than 99{\%} confidence for this variation in polarized dust properties. In addition, we show that the decorrelation increases when there is a decrease in the mean column density of the region of the sky being considered, and we propose a simple power-law empirical model for this dependence, which matches what is seen in the Planck data. We explore the effect that this measured decorrelation has on simulations of the BICEP2-Keck Array/Planck analysis and show that the 2015 constraints from these data still allow a decorrelation between the dust at 150 and 353 GHz that is compatible with our measured value. Finally, using simplified models, we show that either spatial variation of the dust SED or of the dust polarization angle are able to produce decorrelations between 217 and 353 GHz data similar to the values we observe in the data.",
keywords = "Cosmic background radiation, Cosmology: observations, Dust, extinction, Submillimeter: ISM",
author = "N. Aghanim and M. Ashdown and J. Aumont and C. Baccigalupi and M. Ballardini and Banday, {A. J.} and Barreiro, {R. B.} and N. Bartolo and S. Basak and K. Benabed and Bernard, {J. P.} and M. Bersanelli and P. Bielewicz and A. Bonaldi and L. Bonavera and Bond, {J. R.} and J. Borrill and Bouchet, {F. R.} and F. Boulanger and A. Bracco and C. Burigana and E. Calabrese and Cardoso, {J. F.} and Chiang, {H. C.} and Colombo, {L. P L} and C. Combet and B. Comis and Crill, {B. P.} and A. Curto and F. Cuttaia and Davis, {R. J.} and {De Bernardis}, P. and {De Rosa}, A. and {De Zotti}, G. and J. Delabrouille and Delouis, {J. M.} and {Di Valentino}, E. and C. Dickinson and Diego, {J. M.} and O. Dor{\'e} and M. Douspis and A. Ducout and X. Dupac and S. Dusini and G. Efstathiou and F. Elsner and En{\ss}lin, {T. A.} and Eriksen, {H. K.} and A. L{\"a}hteenm{\"a}ki and M. Savelainen and {Planck Collaboration}",
year = "2017",
month = "3",
day = "1",
doi = "10.1051/0004-6361/201629164",
language = "English",
volume = "599",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",

}

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TY - JOUR

T1 - Planck intermediate results

T2 - L. Evidence of spatial variation of the polarized thermal dust spectral energy distribution and implications for CMB B-mode analysis

AU - Aghanim, N.

AU - Ashdown, M.

AU - Aumont, J.

AU - Baccigalupi, C.

AU - Ballardini, M.

AU - Banday, A. J.

AU - Barreiro, R. B.

AU - Bartolo, N.

AU - Basak, S.

AU - Benabed, K.

AU - Bernard, J. P.

AU - Bersanelli, M.

AU - Bielewicz, P.

AU - Bonaldi, A.

AU - Bonavera, L.

AU - Bond, J. R.

AU - Borrill, J.

AU - Bouchet, F. R.

AU - Boulanger, F.

AU - Bracco, A.

AU - Burigana, C.

AU - Calabrese, E.

AU - Cardoso, J. F.

AU - Chiang, H. C.

AU - Colombo, L. P L

AU - Combet, C.

AU - Comis, B.

AU - Crill, B. P.

AU - Curto, A.

AU - Cuttaia, F.

AU - Davis, R. J.

AU - De Bernardis, P.

AU - De Rosa, A.

AU - De Zotti, G.

AU - Delabrouille, J.

AU - Delouis, J. M.

AU - Di Valentino, E.

AU - Dickinson, C.

AU - Diego, J. M.

AU - Doré, O.

AU - Douspis, M.

AU - Ducout, A.

AU - Dupac, X.

AU - Dusini, S.

AU - Efstathiou, G.

AU - Elsner, F.

AU - Enßlin, T. A.

AU - Eriksen, H. K.

AU - Lähteenmäki, A.

AU - Savelainen, M.

AU - Planck Collaboration

PY - 2017/3/1

Y1 - 2017/3/1

N2 - The characterization of the Galactic foregrounds has been shown to be the main obstacle in thechallenging quest to detect primordial B-modes in the polarized microwave sky. We make use of the Planck-HFI 2015 data release at high frequencies to place new constraints on the properties of the polarized thermal dust emission at high Galactic latitudes. Here, we specifically study the spatial variability of the dust polarized spectral energy distribution (SED), and its potential impact on the determination of the tensor-to-scalar ratio, r. We use the correlation ratio of the angular power spectra between the 217 and 353 GHz channels as a tracer of these potential variations, computed on different high Galactic latitude regions, ranging from 80% to 20% of the sky. The new insight from Planck data is a departure of the correlation ratio from unity that cannot be attributed to a spurious decorrelation due to the cosmic microwave background, instrumental noise, or instrumental systematics. The effect is marginally detected on each region, but the statistical combination of all the regions gives more than 99% confidence for this variation in polarized dust properties. In addition, we show that the decorrelation increases when there is a decrease in the mean column density of the region of the sky being considered, and we propose a simple power-law empirical model for this dependence, which matches what is seen in the Planck data. We explore the effect that this measured decorrelation has on simulations of the BICEP2-Keck Array/Planck analysis and show that the 2015 constraints from these data still allow a decorrelation between the dust at 150 and 353 GHz that is compatible with our measured value. Finally, using simplified models, we show that either spatial variation of the dust SED or of the dust polarization angle are able to produce decorrelations between 217 and 353 GHz data similar to the values we observe in the data.

AB - The characterization of the Galactic foregrounds has been shown to be the main obstacle in thechallenging quest to detect primordial B-modes in the polarized microwave sky. We make use of the Planck-HFI 2015 data release at high frequencies to place new constraints on the properties of the polarized thermal dust emission at high Galactic latitudes. Here, we specifically study the spatial variability of the dust polarized spectral energy distribution (SED), and its potential impact on the determination of the tensor-to-scalar ratio, r. We use the correlation ratio of the angular power spectra between the 217 and 353 GHz channels as a tracer of these potential variations, computed on different high Galactic latitude regions, ranging from 80% to 20% of the sky. The new insight from Planck data is a departure of the correlation ratio from unity that cannot be attributed to a spurious decorrelation due to the cosmic microwave background, instrumental noise, or instrumental systematics. The effect is marginally detected on each region, but the statistical combination of all the regions gives more than 99% confidence for this variation in polarized dust properties. In addition, we show that the decorrelation increases when there is a decrease in the mean column density of the region of the sky being considered, and we propose a simple power-law empirical model for this dependence, which matches what is seen in the Planck data. We explore the effect that this measured decorrelation has on simulations of the BICEP2-Keck Array/Planck analysis and show that the 2015 constraints from these data still allow a decorrelation between the dust at 150 and 353 GHz that is compatible with our measured value. Finally, using simplified models, we show that either spatial variation of the dust SED or of the dust polarization angle are able to produce decorrelations between 217 and 353 GHz data similar to the values we observe in the data.

KW - Cosmic background radiation

KW - Cosmology: observations

KW - Dust, extinction

KW - Submillimeter: ISM

UR - http://www.scopus.com/inward/record.url?scp=85014148363&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201629164

DO - 10.1051/0004-6361/201629164

M3 - Article

VL - 599

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A51

ER -

ID: 11258561