2015A&A...576A.104P

Query : 2015A&A...576A.104P

2015A&A...576A.104P - Astronomy and Astrophysics, volume 576A, 104-104 (2015/4-1)

Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust.

PLANCK COLLABORATION, ADE P.A.R., AGHANIM N., ALINA D., ALVES M.I.R., ARMITAGE-CAPLAN C., ARNAUD M., ARZOUMANIAN D., ASHDOWN M., ATRIO-BARANDELA F., AUMONT J., BACCIGALUPI C., BANDAY A.J., BARREIRO R.B., BATTANER E., BENABED K., BENOIT-LEVY A., BERNARD J.-P., BERSANELLI M., BIELEWICZ P., BOCK J.J., BOND J.R., BORRILL J., BOUCHET F.R., BOULANGER F., BRACCO A., BURIGANA C., BUTLER R.C., CARDOSO J.-F., CATALANO A., CHAMBALLU A., CHARY R.-R., CHIANG H.C., CHRISTENSEN P.R., COLOMBI S., COLOMBO L.P.L., COMBET C., COUCHOT F., COULAIS A., CRILL B.P., CURTO A., CUTTAIA F., DANESE L., DAVIES R.D., DAVIS R.J., DE BERNARDIS P., DE GOUVEIA DAL PINO E.M., DE ROSA A., DE ZOTTI G., DELABROUILLE J., DESERT F.-X., DICKINSON C., DIEGO J.M., DONZELLI S., DORE O., DOUSPIS M., DUNKLEY J., DUPAC X., EFSTATHIOU G., ENSSLIN T.A., ERIKSEN H.K., FALGARONE E., FERRIERE K., FINELLI F., FORNI O., FRAILIS M., FRAISSE A.A., FRANCESCHI E., GALEOTTA S., GANGA K., GHOSH T., GIARD M., GIRAUD-HERAUD Y., GONZALEZ-NUEVO J., GORSKI K.M., GREGORIO A., GRUPPUSO A., GUILLET V., HANSEN F.K., HARRISON D.L., HELOU G., HERNANDEZ-MONTEAGUDO C., HILDEBRANDT S.R., HIVON E., HOBSON M., HOLMES W.A., HORNSTRUP A., HUFFENBERGER K.M., JAFFE A.H., JAFFE T.R., JONES W.C., JUVELA M., KEIHAENEN E., KESKITALO R., KISNER T.S., KNEISSL R., KNOCHE J., KUNZ M., KURKI-SUONIO H., LAGACHE G., LAEHTEENMAEKI A., LAMARRE J.-M., LASENBY A., LAWRENCE C.R., LEAHY J.P., LEONARDI R., LEVRIER F., LIGUORI M., LILJE P.B., LINDEN-VORNLE M., LOPEZ-CANIEGO M., LUBIN P.M., MACIAS-PEREZ J.F., MAFFEI B., MAGALHAES A.M., MAINO D., MANDOLESI N., MARIS M., MARSHALL D.J., MARTIN P.G., MARTINEZ-GONZALEZ E., MASI S., MATARRESE S., MAZZOTTA P., MELCHIORRI A., MENDES L., MENNELLA A., MIGLIACCIO M., MIVILLE-DESCHENES M.-A., MONETI A., MONTIER L., MORGANTE G., MORTLOCK D., MUNSHI D., MURPHY J.A., NASELSKY P., NATI F., NATOLI P., NETTERFIELD C.B., NOVIELLO F., NOVIKOV D., NOVIKOV I., OXBORROW C.A., PAGANO L., PAJOT F., PALADINI R., PAOLETTI D., PASIAN F., PEARSON T.J., PERDEREAU O., PEROTTO L., PERROTTA F., PIACENTINI F., PIAT M., PIETROBON D., PLASZCZYNSKI S., POIDEVIN F., POINTECOUTEAU E., POLENTA G., POPA L., PRATT G.W., PRUNET S., PUGET J.-L., RACHEN J.P., REACH W.T., REBOLO R., REINECKE M., REMAZEILLES M., RENAULT C., RICCIARDI S., RILLER T., RISTORCELLI I., ROCHA G., ROSSET C., ROUDIER G., RUBINO-MARTIN J.A., RUSHOLME B., SANDRI M., SAVINI G., SCOTT D., SPENCER L.D., STOLYAROV V., STOMPOR R., SUDIWALA R., SUTTON D., SUUR-USKI A.-S., SYGNET J.-F., TAUBER J.A., TERENZI L., TOFFOLATTI L., TOMASI M., TRISTRAM M., TUCCI M., UMANA G., VALENZIANO L., VALIVIITA J., VAN TENT B., VIELVA P., VILLA F., WADE L.A., WANDELT B.D., ZACCHEI A. and ZONCA A.

Abstract (from CDS):

This paper presents an overview of the polarized sky as seen by Planck HFI at 353GHz, which is the most sensitive Planck channel for dust polarization. We construct and analyse maps of dust polarization fraction and polarization angle at 1° resolution, taking into account noise bias and possible systematic effects. The sensitivity of the Planck HFI polarization measurements allows for the first time a mapping of Galactic dust polarized emission on large scales, including low column density regions. We find that the maximum observed dust polarization fraction is high (pmax=19.8%), in particular in some regions of moderate hydrogen column density (NH< 2x1021cm–2). The polarization fraction displays a large scatter at NH below a few 1021cm–2. There is a general decrease in the dust polarization fraction with increasing column density above NH≃1x1021cm–2 and in particular a sharp drop above NH≃1.5x1022cm–2. We characterize the spatial structure of the polarization angle using the angle dispersion function. We find that the polarization angle is ordered over extended areas of several square degrees, separated by filamentary structures of high angle dispersion function. These appear as interfaces where the sky projection of the magnetic field changes abruptly without variations in the column density. The polarization fraction is found to be anti-correlated with the dispersion of polarization angles. These results suggest that, at the resolution of 1°, depolarization is due mainly to fluctuations in the magnetic field orientation along the line of sight, rather than to the loss of grain alignment in shielded regions. We also compare the polarization of thermal dust emission with that of synchrotron measured with Planck, low-frequency radio data, and Faraday rotation measurements toward extragalactic sources. These components bear resemblance along the Galactic plane and in some regions such as the Fan and North Polar Spur regions. The poor match observed in other regions shows, however, that dust, cosmic-ray electrons, and thermal electrons generally sample different parts of the line of sight.

Abstract Copyright: ∼

Journal keyword(s): ISM: general - dust, extinction - ISM: magnetic fields - ISM: clouds - submillimeter: ISM

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME PSC CL ClG 00 58 25.0 +30 39 11           ~ 130 1
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5838 1
3 * alf UMi cC* 02 31 49.09456 +89 15 50.7923 3.00 2.62 2.02 1.53 1.22 F8Ib 673 2
4 NAME Per Region reg 03 37 00.0 +31 15 00           ~ 271 0
5 NAME Auriga reg 04 20 00.0 +38 05 00           ~ 207 0
6 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4416 0
7 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 579 0
8 NAME OMC-2/3 reg 05 35 33.0 -05 00 32           ~ 91 0
9 NAME Gal Anticenter reg 05 46 +28.9           ~ 912 0
10 NAME PYX GLOBULAR CL GlC 09 07 57.80 -37 13 17.0           ~ 107 0
11 NAME Polaris Flare MoC 11 00 14.8 +86 10 52           ~ 192 1
12 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
13 NAME North Polar Spur ISM 12 00 +00.0           ~ 372 1
14 NAME Musca Cld 12 23 -71.3           ~ 221 0
15 NAME Loop I SR? 15 01 -38.7           ~ 387 2
16 LDN 134 MoC 15 53 36.3 -04 35 26           ~ 208 0
17 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
18 NAME Her Region reg 17 21 +50.0           ~ 40 0
19 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 403 1
20 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14415 0
21 NAME Aql Region reg 18 31.1 -02 10           ~ 391 0
22 NAME Aql Rift DNe 18 32 -01.0           ~ 316 1
23 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 109 1
24 NAME Cyg X BL? 20 30 04.7973633 +40 51 36.002197           ~ 845 1
25 NAME MICROSCOPIUM SUPERCL SCG 20 36 -34.8           ~ 10 0
26 NAME Pavo Field reg 21 14 -57.8           ~ 18 0
27 NAME Ara reg ~ ~           ~ 20 0
28 NAME Libra ? ~ ~           ~ 19 0

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